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In his famous novel The Moon is a Harsh Mistress, Robert A. Heinlein describes a future lunar settlement where future lunar residents (“Loonies”) send payloads of wheat and water ice to Earth using an electromagnetic catapult. In this story, a group of Loonies conspire to take control of this catapult and threaten to “throw rocks at Earth” unless they recognize Luna as an independent world. Interestingly enough, scientists have explored this concept for decades as a means of transferring lunar resources to Earth someday.

Given that space agencies are planning on sending missions to the Moon to create permanent infrastructure, there is renewed interest in this concept. In a recent paper, a team of scientists from China’s Shanghai Institute of Satellite Engineering (SAST) detailed how a magnetic launcher on the lunar surface could provide a cost-effective means of sending resources back to Earth. This proposal could become part of China’s long-term vision for a lunar settlement known as the International Lunar Research Station (ILRS) – a joint project they are pursuing with the Russian space agency (Roscosmos).

According to a recent article in the South China Morning Post, the catapult would utilize magnetic levitation (maglev) technology and operate on the same principle as the hammer throw in athletics, “but rotating at increasing speeds before throwing the launch capsule towards Earth.” On the lunar surface, the near-vacuum environment and low gravity – roughly 16.5% of Earth’s gravity (0.165 g) – would facilitate the ejection of payloads. According to the SAST team, the proposed system could conduct two launches a day at one-tenth the cost of existing transport methods.

Visualization of the ILRS from the CNSA Guide to Partnership (June 2021). Credit: CNSA

As noted, the concept of a magnetic catapult on the Moon is a time-honored idea. Previous versions of the concept include the Slingatron proposed in 1998 by noted physicist Derek A. Tidman, which called for a circular magnetic accelerator rather than a rotating arm. Similarly, the launch system proposed by the Chinese research team would consist of a 50-meter (165 ft) rotating arm and a high-temperature superconducting motor. It would be powered by solar panels and a nuclear reactor and is designed to convert kinetic energy into electricity during the deceleration phase. This would allow it to recover more than 70% of the energy consumed after each launch.

After accelerating for ten minutes, the arm would achieve the Moon’s escape velocity of 2.4 km/second (1.5 mps) and release the payload on a trajectory toward Earth. The team also emphasizes that the main payload would be helium-3 harvested from lunar soil, which could be used to power fusion reactors on Earth. “The system’s technical readiness is relatively high,” they wrote. “Since it consumes only electricity and does not require any propellant, it will be relatively small in scale and straightforward to implement. The main goal is to extract and return helium-3 to help address Earth’s energy crisis. The project will also boost the development of space mining technologies, heavy launch vehicles, and artificial intelligence.”

While only 0.5 metric tons (0.55 U.S. tons) of this element can be found on Earth, an estimated 1 million metric tons (1.1 U.S. tons) are contained within the Moon’s regolith. According to the team’s paper, 20 metric tons (22 U.S. tons) would be enough to meet China’s annual electricity needs, whereas 1 million metric tons would be enough to meet the world’s energy needs for over a thousand years. They also estimate that the system will weigh about 80 metric tons (88 U.S. tons) and could remain in operation for at least 20 years.

However, construction of this system will have to wait until China has finished developing its Long March 9 (CZ-9) and Long March 10 (CZ-10) super-heavy launch vehicles. These rockets are vital to creating the ILRS, which is expected to be completed by 2035 with the help of other national space agencies. In this respect, the proposed launch system could become a part of China’s long-term plans for lunar development during the late 2030s or 2040s. The team’s proposed timelines are consistent with this: they hope to complete the development of the system’s key components by 2030 and anticipate full-scale implementation by 2045.

An artist’s concept of Hyper V Technologies Corp.’s Slingatron launch system, a 200-300 meter wide railroad into space. Credit: Hyper V Technologies Corp.

Naturally, as with all other proposals for lunar construction and development, there is the issue of cost. According to the research team, the cost of building the launch system would be an estimated 130 billion, equivalent to 18.25 billion USD. However, at last year’s meeting of the China Association for Science and Technology (CAST), team member Chu Yingzhi stated that mining three to five tonnes of helium-3 annually could bring in revenues of 100 billion yuan. There are also a lot of technical and logistical challenges that need to be addressed before this system can be constructed.

For starters, the research team’s paper does not address how Helium-3 will be extracted from the local regolith. As Chu noted, there’s also the challenge of installing it on the rugged lunar surface, ensuring the rotating arm remains stable at high speeds, and ensuring it can operate in the lunar environment, which is subject to extreme variations in temperature, cosmic rays, and increased levels of solar radiation. But as a long-term vision, a magnetic launch system is an elegant proposal and a relatively cost-effective alternative to spacecraft launching from the surface.

Further Reading: South China Morning Post

The post China Proposes Magnetic Launch System for Sending Resources Back to Earth appeared first on Universe Today.

A team of researchers has discovered a set of methods that enabled the first successful CRISPR-based genome editing in Nile grass rats.

A monument in southern Spain that dates to between 3600 and 3800 BC appears to have been built with an understanding of geology and physics

A monument in southern Spain that dates to between 3600 and 3800 BC appears to have been built with an understanding of geology and physics

A multi-institutional team of scientists has developed a new superconductor material that could potentially be used in quantum computing and be a candidate 'topological superconductor.'

A multi-institutional team of scientists has developed a new superconductor material that could potentially be used in quantum computing and be a candidate 'topological superconductor.'

One of many photos taken over the last two days around Hoedspruit and the Blyde River Canyon, a fantastic canyon not far away. Can you spot the baby crocodile?

I’ll provide a reveal tomorrow South African time, though this one shouldn’t be too hard. Click to enlarge the photo.

(There will likely be a photo post tomorrow, though perhaps from Manyeleti.)

A new study provides insights on the geophysics behind asteroid formation and evolution.

To guide future research into solar geoengineering, an international group of scientists is making specific recommendations for evaluating proposals in order to identify the most feasible and legitimate scenarios for stratospheric aerosol intervention.

When the fever, pains and pus-filled lesions of an mpox infection strike, how dangerous is it and how can it be treated?

Computers made from DNA have previously only been able to store information or perform computations on it – now a new device can do both

A 3D quantum spin liquid has been discovered in the vicinity of a member of the langbeinite family. The material's specific crystalline structure and the resulting magnetic interactions induce an unusual behavior that can be traced back to an island of liquidity. An international team has made this discovery with experiments at the ISIS neutron source and theoretical modelling on a nickel-langbeinite sample.

Superconductivity theory proposed by physics team validated in international experiment: Cooper pairs display wave-like distribution in Kagome metals, enabling new technological applications like superconducting diodes.

A team of researchers has created a digital pathology platform based on artificial intelligence. The platform uses new algorithms developed by the team and enables fully automated analysis of tissue sections from lung cancer patients. The platform makes it possible to analyze digitized tissue samples on the computer for lung tumors more quickly and accurately than before.

Building on a landmark algorithm, researchers propose a way to make a smaller and more noise-tolerant quantum factoring circuit for cryptography.

Building on a landmark algorithm, researchers propose a way to make a smaller and more noise-tolerant quantum factoring circuit for cryptography.

The Milky Way may be home to strange black holes from the first moments of the universe, and the best candidates are the three closest black holes to Earth

Radio astronomers teamed up with SpaceX to find a promising solution for helping expensive telescopes avoid interference from thousands of Starlink satellites

Astronomers have identified patterns within the motion of stars stretching across the Milky Way, hinting at the presence of a vast wave

Do we live in a patriarchy? Does toxic masculinity permeate our society? Are they the reasons why women are paid less than men, and fewer women are working in STEM? There is a long-documented history of these differences, and they go deeper than you might think. Let’s consider some causal explanations.

The Gender Pay Gap

One statistic offered as evidence of male hegemony (i.e., the patriarchy) is the ubiquitous gender pay gap that exists between men and women. For example, self-described feminist economists1 Xuan Pham, Laura Fitzpatrick, and Richard Wagner suggest:

…the two overarching institutions that enable the persistence of the GPG [gender pay gap] in the USA are capitalism and patriarchy. Capitalism is a production system is [sic] driven by the profit motive, meaning firms seek to cost minimize. If employers can pay whole segments of workers lower wages, it is easier to boost profit margins and preserve capitalist production. The incentive to do this is quite powerful and a society that relegates women to a lesser position through non-labor market forces enhances the potential to increase exploitation of women through differential wages relative to men… Capitalism alone cannot create the GPG, however. The other crucial institution, patriarchy—allowing for gender-based disparate treatment—has deep roots in U.S. society. At the country’s founding, women were no more than the property of men.2

The ratio of annual earnings between women and men has gone from a low of 59 cents on the dollar in 1963 to 84 cents for every dollar earned by men in 2024.3 Pham et al. claim the patriarchy is responsible for the gender pay gap—that is, wholesale discrimination against women. Most leading economists, regardless of their gender, disagree. Cornell University economists Francine Blau and Lawrence Kahn point out4 most of the reduction in the pay gap came in the 1980s and early 1990s during a “sharp increase in female participation rates” in the work force—increasing from 32 percent in 1947 to 57 percent in 2014 while the male participation rate fell from 87 to 69 percent over the same period.

Countering the oppressive patriarchy argument, an extraordinary and remarkable natural experiment that demonstrates the lack of discrimination in the differences in pay between men and women was conducted by researchers at Stanford University in 2018 using data from over one million Uber drivers. Uber pays their drivers according to a rigid “non-negotiated formula” (i.e., invariant among drivers), and they do not offer any employee benefits. The drivers also determine when and where they work. Each driver earns a specific base fare in addition to a “per-minute and per-distance” fare beginning with the pickup and ending with the drop off of a customer. During periods of high customer demand, drivers can receive a “surge multiplier.” More importantly as related to the gender pay gap, there are no promotions, work overtime pay, or any ability to negotiate higher pay for drivers. In other words, earnings are directly proportional to productivity. The Stanford researchers have also demonstrated that there is no meaningful customer discrimination toward female or male drivers. In other words, there are no statistically significant differences in customer ratings of men and women drivers nor do riders prefer one gender to the other.5

*Men make more on a weekly basis, but much of the weekly difference is due to men working more hours. The percent difference in the pay gap is presented as per hour to avoid work amount variations.

The results of the study show unequivocally that men earn about 7 percent more than women on an hourly basis.* The “entire gap” can be explained by three factors, all unrelated to discrimination:

1. Men tend to drive faster than women. This leads to an increase in pay because they handle more customers per hour.
2. Uber pays a “compensating differential” for driving in high-crime areas and areas with high concentrations of bars. Men tend to drive in the more lucrative areas not only because they accept the risk but also because they are inclined to live nearer to or within these areas compared with women.
3. Drivers who work 30 or more hours per week compared to those that work fewer than 10 hours per week make 9 percent more per hour. Why is that? There is much to gain from experience at Uber such as when and where to drive, or which trips a driver should accept or reject. The researchers stated, “Male drivers accumulate more experience than women by driving more each week and being less likely to stop driving with Uber.”

†The Stanford team noted in 2018 that “nearly every one of the parameters favors men earning more. Men have shorter trips to the rider, longer trips, faster speed, higher surge, and more incentives.”

Experience in other studies is typically measured by years of employment or a worker’s age which are notoriously poor ways of ascertaining work experience. As the Uber study suggests, experience differentials between men and women may be underestimated in previous studies and “can lead to biased estimates of the job-flexibility penalty.” Put another way, by working fewer hours, women are not only earning less pay than men but also accumulating less experience.† The Stanford team concludes:

Even in the absence of discrimination and in flexible labor markets, women’s relatively high opportunity cost of non-paid work time and gender-based differences in preferences and constraints can sustain a gender pay gap.

A study by two Harvard economists on bus and train operators produced similar results—the pay gap in favor of men is due to the differential choice preferences of men and women.6 Even though “in a unionized environment where work tasks are similar, hourly wages are identical, and tenure dictates promotions, female workers earn $0.89 on the male-worker dollar.” The same study revealed that women were also less likely than men to game the scheduling system by trading off work hours at regular wages for overtime hours at premium wages.

Economists at Cornell University7, 8 have recently completed two extremely detailed and extensive reviews of the research literature demonstrating factors that influence the gender pay gap. A few of them are obvious. Gender differences in choice of college majors funnel women into lower paying careers. For example, women tend to avoid majoring in science, technology, engineering, and math (STEM) programs resulting in fewer women in these relatively high-paying careers. Women also tend to avoid jobs requiring extensive training specific to the company they are working for, i.e., training that does not help them with other companies.

Although both men and women quit their jobs at about the same rate “all else being equal,” they quit for different reasons. Men quit for reasons primarily related to the job; in contrast, women quit, for the most part, because of family-related reasons. As a result, women’s wages are affected adversely compared to men probably because women miss out on experience through training. Married women and mothers focus on home and family reducing the number of hours they spend in the labor market. Not surprisingly, research has found that the more hours women spend doing housework, the lower their wages in the market.

We should foster working environments that reward the most qualified and competent candidates, encouraged to participate irrespective of their gender.

The choice families make regarding their working locations also impact wages. Men are still the primary wage earners in families, and families tend to choose the location of the husband’s work as opposed to where the wife works (probably because, on average, men tend to focus on careers while women tend to prioritize family). Recent research in the U.S. and Great Britain has revealed that total family earnings increase significantly while the wife’s earnings decline when the family relocates.9 As a result, although women may enter into traditionally male-oriented occupations, they often select careers that are flexible geographically (e.g., physicians, pharmacists, managers, accountants, etc.).10, 11

But the largest single impact on the gender wage gap appears to be the difference in pay between the careers men and women choose (as much as a third of the gap!). The companies women tend to gravitate toward are those that pay both men and women lower wages whereas men tend to be concentrated in firms that pay more to both men and women. Women may consciously be choosing companies that are less stressful and offer more flexible work hours, but pay less than those where greater demands are made. As Blau and Kahn explain:

Men are found to place a higher value on money, to have higher self-esteem, to be less risk averse, more competitive, self-confident and disagreeable, and to believe that they control their own fate (an internal, as opposed to external, locus of control) to a greater extent than women.

From a broader perspective, men may have traditionally needed to excel in these arenas not only to provide for their families but also to succeed in competing with other men for mates. It is well established that men spend longer hours in their jobs, tend to place work over family, and take less time off from their jobs, which has a large impact on wages. One study presented men and women in the laboratory with a task to solve under two conditions of compensation—in a “noncompetitive piece rate and then a competitive tournament incentive scheme.”12 There were no differences between the performance of men and women, but 73 percent of the men preferred the competitive tournament scenario compared to 35 percent of the women.

The competitiveness of men translates from the laboratory into real-life performance benefits. Researchers have found that high school boys and girls have, on average, similar academic abilities. However, boy’s higher level of competitiveness correlates with their choosing to go into “more prestigious academic tracks” than do girls.13 Field research substantiates these results. In a large study, economists posted online job advertisements in 16 major cities that randomly varied the advertisements in their compensation regimes. Based on the 9,000 people assessing the job advertisements, the researchers were able to conclude that, “women disproportionately shy away from competitive work settings.”14 Increasing the competition within the workplace also appears to increase the performance of men relative to women.15, 16 Many studies have also found that on average not only do women shy away from risk, but their wages are lower due to having greater risk aversion than men.17 Controlling for extraneous effects, employers tend to pay more to entice workers to accept risk.

Yet another primary influence on the gender pay gap is a preference by women for what economists refer to as “work-force interruptions,” which include flexibility (such as working at home or at convenient times) and working fewer hours (a decision not to put in the long hours required by some jobs). Numerous recent studies have explored the impact of workforce interruptions and shorter hours, and it is worth discussing them in detail because they are pertinent within the context of the “glass ceiling,” a term that refers to the discriminatory barriers hindering women from attaining top-level, high-paying jobs in the labor market.

One of these studies followed MBA graduates from a distinguished program and found that women and men began their careers at nearly the same pay, but their pay diverged over time and men were paid more. The conclusion of the research posited that the gender pay gap can be attributed almost entirely to the fewer weekly hours women worked and the larger number of “career interruptions” women took compared to men.18 Another study, conducted over a fifteen-year period and focusing on lawyers, revealed an interesting trend: while gender had little impact on initial salaries, the gender pay gap significantly widened over time. This was attributed to women working shorter hours and taking time off for childbirth.19 A recent study by Ghazala Azmat and her colleague Rosa Ferrer found a similar disparity between male and female lawyers and attributed the difference to men obtaining more clients and receiving twice as much revenue from those clients compared to women. The authors concluded the disparities between men’s and women’s earnings and promotions were due to higher workplace performance by men compared to women.20 It is worth quoting their findings:

Possible channels of direct discrimination in law firms—whereby, for instance, senior lawyers (i.e., law firm partners) could interfere with performance—are not strong determinants of performance gaps. The presence of preschool children in the household contributes to the gaps in performance; however, it is not the only key determinant. A substantial share of the gender gap in performance is explained by aspirations to become a partner, which are likely to reflect more general career concerns as well as traditional gender roles… We find that the distribution of career aspirations differs across genders, which is reflected in the differences in performance [i.e., women do not aspire to become partners as much as their male counterparts]… One potential implication is that gender-based inequality in earnings and career outcomes might not decrease in the near future—and could even increase—as more high-skilled workers are explicitly compensated on the basis of performance.

In 2014, Harvard economist Claudia Goldin showed that the gender pay gap increases over the lifespan of laborers particularly for college-educated employees.21 She explained that the gender pay gap can “almost entirely be explained by various factors such as hours worked, time out of the labor force, and years spent in part-time employment.” In 2017, economist Erling Barth and his colleagues evaluated the gender pay gap over the time span of employee careers by analyzing data from the 2000 Decennial Census of the United States and the Longitudinal Employer Household Dynamics. Their findings? The gender pay gap starts out relatively small but widens over time for both college-educated and non-college educated men and women. The largest gap is among the college educated men and women. The researchers found the gap (in both college and non-college scenarios) is primarily attributed to married women earning less and “most of the loss in earnings growth for married women, relative to married men, occurs concurrently with the arrival of children.”22

David Lubinski and his colleagues conducted a 35-year longitudinal study following some of the most intellectually gifted people in the United States.23, 24 This research led to two major conclusions that tracked with other findings here. (1) Intellectually exceptional women prefer to work with people rather than “things,” unlike their male counterparts, who often exhibit the opposite preference. This aligns with other findings indicating that both women and men choose careers based on their individual strengths and interests. For example, women score higher than men on verbal abilities, while men tend to excel in mathematical abilities. And even though fewer women go into STEM (women received only 25.1 percent and 23.4 percent of the doctorates in mathematics/computer science and engineering, respectively), those that do, score similar to men in ability and interest. In other words, women who pursue careers in STEM fields exhibit exceptional mathematical and spatial reasoning abilities, and their mathematical and spatial abilities are typically greater than their verbal abilities. (2) On average, gifted men earn higher salaries than their female counterparts after 35 years. The main reason for this is that men work more hours than women suggesting once again that men put more emphasis on work than women. Not only do men work longer hours but when both genders are asked “How many hours would you choose to work if you were in the job of choice” [i.e., desired job, place of work, and the pay required] women chose fewer hours than men.

Regarding the quote at the beginning of this article, Steve Horwitz, Distinguished Professor of Free Enterprise, commented on Pham and colleagues’ supply/ demand hypothesis (for example, the abundance of women as teachers in grades K–12) this way: “Those jobs tend to pay less because they are jobs where many people have the relevant skills to do them, thus employers can always find another person to fill them (male or female!), which keeps wages low. The same is true of garbage collectors, who are almost all male. Their wages are much lower than those of teachers and nurses because even more people have the relevant skills. So, perceptions of the femininity of a job [i.e., social constructionism] can’t really explain why wages are low.”25 If more people, whether they are men or women (supply), go into specific fields, those fields will be able to pay less for workers (demand).

The Glass Ceiling

The National Science Foundation is pouring money into programs established to encourage women to enter STEM fields. For example, Howard University recently received $1.3 million for a proposal entitled “Multiple Consciousnesses: Investigating the Identities (Academic, Gender, Race, and Disability) of Black Women Undergraduate Students in STEM and Their Impact on Persistence.”26 Funding such as this presumes the gender pay gap and the glass ceiling are due to discrimination against women. However, as we have seen, economists—many of whom are women, as cited—have challenged these assumptions.

A recent study demonstrates the impact of women’s choice on the glass ceiling. Psychologists Gijsbert Stoet and David Geary published a paper27 documenting the gender gap in STEM fields has remained relatively constant for decades despite heroic efforts to bring women into STEM fields.28 They discovered the largest STEM gender gaps exist in countries that test high on the Global Gender Gap Index (GGGI)—a measure of the degree of parity between men and women based on 14 indicators, which include earnings, seats in parliament, the number of women relative to men that enroll in universities, life expectancy, etc. The GGGI uses a scale from 0 to 1, where 1.0 represents complete gender parity (see Figure 1). The data comes from the Programme for International Student Assessment (PISA)29—an educational survey of 519,334 students from 72 countries. Upon reviewing the graph, you may observe that the data might seem somewhat counterintuitive. This unexpected correlation is referred to as the educational-gender-equality paradox.

Figure 1. A graph of gender equality (GGGI where 1.0 = gender parity) versus the percentage of women that graduate from STEM-related fields in each country. The line represents the best-fit least squares regression.

The Nordic countries (Denmark, Finland, Iceland, Norway, and Sweden) exemplify this paradox. They have established more than generous opportunities for women in maternity leave, first-rate state-provided childcare, and gender quotas for stock-market company boards.30 Yet they have some of the largest gender gaps in the world! For example, Finland ranks second in science literacy, and girls outperform boys on the tests. However, paradoxically, the number of women graduating with STEM degrees only approaches 20 percent. In contrast, countries with treatment of women ranging from fair to poor, such as Algeria, the United Arab Emirates, and Tunisia, have over 35 percent women graduating in STEM on average.

Stoet and Geary found that “girls performed similarly or better than boys in science” in 66 percent of the countries “and in nearly all the countries, more girls appeared capable of college-level STEM study than had enrolled.” They attribute the anomaly to personal academic choice related to what each gender perceives as their personal strength. Girls do better on literacy testing than they do in mathematics and science. Even though girls do better than boys in science and mathematics in many countries such as Finland, they choose fields outside of STEM. The opposite is true for boys. They do better in science and mathematics than literacy, and consequently choose STEM more than girls. The researchers also emphasize that women in less gender-equal countries may be more prone to choose STEM fields based on economic stress than personal preference.

It may be time to move away from activist ideology and acknowledge that girls and women freely choose their interests; they are not discriminated against in STEM fields, nor are they discouraged from pursuing a career in these fields. Similar holds true regarding men, even when countries such as Finland and Sweden go to extraordinary lengths to get more men into nursing and other fields traditionally dominated by women.

For a long time, radical feminists have advocated for quotas to break up the perceived patriarchal havens (often referred to as “good-ole-boy networks”) in the hopes of creating environments that support the advancement of women into senior management positions. Norway provides a notable example of the drawbacks of implementing such quotas. In 2003, Norway passed a law mandating that all publicly traded Norwegian corporations must ensure that their corporate boards comprise at least 40 percent women (or men, if the board was predominantly women). Five economists—all women—led by Marianne Bertrand have assessed the impact of the law:

…within firms that were mandated to increase female participation on their board, there is no evidence that these gains at the very top trickled down. Moreover the reform had no obvious impact on highly qualified women whose qualifications mirror those of board members but who were not appointed to boards. We observe no statistically significant change in the gender wage gaps or in female representation in top positions… Finally, there is little evidence that the reform affected the decisions of women more generally; it was not accompanied by any change in female enrollment in business education programs, or a convergence in earnings trajectories between recent male and female graduates of such programs.31

It appears that Norway was trying to correct for a glass ceiling that did not actually exist. As reported by The Economist, the law led to a significant number of Norwegian corporations leaving the Norway stock exchange to avoid the mandated quota requirements. Of the 563 companies on the Norway stock exchange in 2003, only 179 remained by 2008.32 Meanwhile, the observed increase in women’s leadership was the same as in neighboring Denmark, which did not implement quotas.

This article appeared in Skeptic magazine 29.2
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Simply stated, economists—many of whom are women—have found that women are more risk averse (i.e., less willing to place themselves in highly competitive job environments) and more inclined toward occupations that offer flexible hours, often in order to prioritize time with their children. Women are certainly as competent as men in STEM, but gravitate toward college majors and jobs that highlight their superior verbal and social skills. There is much more fascinating data—most of it largely absent from the public discourse—that shed light on these differences. I will discuss such scholarship from disciplines other than economics in future articles.

Why is a scientific approach so important in this case? If political activists succeed in convincing the public that pay disparities between men and women are due to discrimination through an ominous patriarchy and toxic masculinity, not only will the data be ignored, but hardworking men will be discriminated against in favor of parity. I am not suggesting women should be discouraged from entering competitive fields; on the contrary, I am arguing for fairness. We should foster working environments that reward the most qualified and competent candidates, encouraged to participate irrespective of their gender. There is no glass ceiling, i.e., the purported discriminatory barrier that keeps qualified women from achieving top-level, high-paying jobs in the labor market in the United States, Canada, and many other Western countries subject to extensive research. The available evidence reveals that the primary hindrance to upward mobility is often the choices made by women—whether consciously or subconsciously—with regard to employment flexibility.33

About the Author

Marc J. Defant is a professor of geology at the University of South Florida specializing in the study of volcanoes—more specifically, the geochemistry of volcanic rocks. He has been funded by the NSF, National Geographic, the American Chemical Society, and the National Academy of Sciences and has published in many international journals including Nature. His book Voyage of Discovery: From the Big Bang to the Ice Age is in the 2nd edition.

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2. Ibid.
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