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Earth’s protective atmosphere has sheltered life for billions of years, creating a haven where evolution produced complex lifeforms like us. The ozone layer plays a critical role in shielding the biosphere from deadly UV radiation. It blocks 99% of the Sun’s powerful UV output. Earth’s magnetosphere also shelters us.

But the Sun is relatively tame. How effective are the ozone and the magnetosphere at protecting us from powerful supernova explosions?

Every million years—a small fraction of Earth’s 4.5 billion-year lifetime—a massive star explodes within 100 parsecs (326 light-years) of Earth. We know this because our Solar System sits inside a massive bubble in space called the Local Bubble. It’s a cavernous region of space where hydrogen density is much lower than outside the bubble. A series of supernovae explosions in the previous 10 to 20 million years carved out the bubble.

Supernovae are dangerous, and the closer a planet is to one, the more deadly its effects. Scientists have speculated on the effects that supernova explosions have had on Earth, wondering if it triggered mass extinctions or at least partial extinctions. A supernova’s gamma-ray burst and cosmic rays can deplete Earth’s ozone and allow ionizing UV radiation to reach the planet’s surface. The effects can also create more aerosol particles in the atmosphere, increasing cloud coverage and causing global cooling.

A new research article in Nature Communications Earth and Environment examines supernova explosions and their effect on Earth. It is titled “Earth’s Atmosphere Protects the Biosphere from Nearby Supernovae.” The lead author is Theodoros Christoudias from the Climate and Atmosphere Research Center, Cyprus Institute, Nicosia, Cyprus.

The Local Bubble isn’t the only evidence of nearby core-collapse supernovae (SNe) in the last few million years. Ocean sediments also contain 60Fe, a radioactive isotope of iron with a half-life of 2.6 million years. SNe expel 60Fe into space when they explode, indicating that a nearby supernova exploded about 2 million years ago. There’s also 60Fe in sediments that indicate another SN explosion about 8 million years ago.

This graphic from the research article shows the potential atmospheric and climate impacts of a nearby supernova. Gamma rays can deplete the ozone, allowing more UV radiation to reach Earth’s surface. Some UV radiation is ionizing, meaning it can damage DNA. Cosmic rays can also create more condensation nuclei, meaning more clouds and potential global cooling, Image Credit: Christoudias et al. 2024

Researchers have correlated an SN explosion with the Late Devonian extinction about 370 million years ago. In one paper, researchers found plant spores burned by UV light, an indication that something powerful depleted Earth’s ozone layer. In fact, Earth’s biodiversity declined for about 300,000 years prior to the Late Devonian extinction, suggesting that multiple SNe could’ve played a role.

Earth’s ozone layer is in constant flux. As UV energy reaches it, it breaks ozone molecules (O3) apart. That dissipates the UV energy, and the oxygen atoms combine into O3 again. The cycle repeats. That’s a simplified version of the atmospheric chemistry involved, but it serves to illustrate the cycle. A nearby supernova could overwhelm the cycle, depleting the ozone column density and allowing more deadly UV to reach Earth’s surface.

But in the new paper, Christoudias and his fellow authors suggest that Earth’s ozone layer is much more resilient than thought and provides ample protection against SNe within 100 parsecs. While previous researchers have modelled Earth’s atmosphere and its response to a nearby SN, the authors say that they’ve improved on that work.

They modelled Earth’s atmosphere with an Earth Systems Model with Atmospheric Chemistry (EMAC) model to study the impact of nearby SNe explosions on Earth’s atmosphere. Using EMAC, the authors say they’ve modelled “the complex atmospheric circulation dynamics, chemistry, and process feedbacks” of Earth’s atmosphere. These are needed to “simulate stratospheric ozone loss in response to elevated ionization, leading to ion-induced nucleation and particle growth to CCN” (cloud condensation nuclei.)

“We assume a representative nearby SN with GCR (galactic cosmic ray) ionization rates in the atmosphere that are 100 times present levels,” they write. That correlates with a supernova explosion about 100 parsecs or 326 light-years away.

These panels from the research letter show the ozone column percentage decrease from a 100-fold increase in GCR intensity over nominal. The left vertical axis represents Earth’s latitude, and the x-axis shows the time of year. Ozone loss is more pronounced over the poles due to the effect of Earth’s magnetosphere, where it’s weaker. a is present-day Earth, while b represents an ancient Earth with only 2% oxygen during the pre-Cambrian. Image Credit: Christoudias et al. 2024

“The maximum ozone depletion over the poles is less than the present-day anthropogenic ozone hole over Antarctica, which amounts to an ozone column loss of 60–70%,” the authors explain. “On the other hand, there is an increase of ozone in the troposphere, but it is well within the levels resulting from recent anthropogenic pollution.”

But let’s cut to the chase. We want to know if Earth’s biosphere is safe or not.

The maximum mean stratospheric ozone depletion from 100 times more ionizing radiation than normal, representative of a nearby SN, is about 10% globally. That’s about the same decrease as our anthropogenic pollution causes. It wouldn’t affect the biosphere very much.

“Although significant, it is unlikely that such ozone changes would have a major impact on the biosphere, especially because most of the ozone loss is found to occur at high latitudes,” the authors explain.

But that’s for modern Earth. During the pre-Cambrian, before life exploded in a multiplication of forms, the atmosphere had only about 2% oxygen. How would an SN affect that? “We simulated a 2% oxygen atmosphere since this would likely represent conditions where the emerging biosphere on land would still be particularly sensitive to ozone depletion,” the authors write.

“Ozone loss is about 10–25% at mid-latitudes and an order of magnitude lower in the tropics,” the authors write. At minimum ozone levels at the poles, ionizing radiation from an SN could actually end up increasing the ozone column. “We conclude that these changes of atmospheric ozone are unlikely to have had a major impact on the emerging biosphere on land during the Cambrian,” they conclude.

What about global cooling?

Global cooling would increase, but not to a dangerous extent. Over the Pacific and Southern oceans, CCN could increase by up to 100%, which sounds like a lot. “These changes, while climatically relevant, are comparable to the contrast between the pristine pre-industrial atmosphere and the polluted present-day atmosphere.” They’re saying that it would cool the atmosphere by about the same amount as we’re heating it now.

These two panels from the research help illustrate the global cooling effect from a nearby SN exposing Earth to 100 times more ionizing radiation. b shows the fractional change in CCN relative to the present day. d shows the fractional change in outgoing solar radiation relative to the present day due to increased cloud albedo. Image Credit: Christoudias et al. 2024

The researchers point out that their study concerns the entire biosphere, not individuals. “Our study does not consider the direct health risks to humans and animals resulting from exposure to elevated ionizing radiation,” they write. Depending on individual circumstances, individuals could be exposed to dangerous levels of radiation over time. But overall, the biosphere would hum along despite a 100-fold increase in UV radiation. Our atmosphere and magnetosphere can handle it.

“Overall, we find that nearby SNe are unlikely to have caused mass extinctions on Earth,” the authors write. “We conclude that our planet’s atmosphere and geomagnetic field effectively shield the biosphere from the effects of nearby SNe, which has allowed life to evolve on land over the last hundreds of million years.”

This study shows that Earth’s biosphere will not suffer greatly as long as supernova explosions keep their distance.

The post Earth’s Atmosphere is Our Best Defence Against Nearby Supernovae appeared first on Universe Today.

More than 130 years after cyclodextrins were first discovered and reported, a team of scientists has created chemical mirror images of these complex carbohydrates in the laboratory. This discovery may revolutionize how medications are delivered to patients.

A new technique can model an entire 3D scene, including areas hidden from view, from just one camera image. The method relies on image shadows, which provide information about the geometry and location of hidden objects.

A new technique can model an entire 3D scene, including areas hidden from view, from just one camera image. The method relies on image shadows, which provide information about the geometry and location of hidden objects.

New simulations show that hot neutrinos created at the interface of merging binary neutron stars are briefy trapped and remain out of equilibrium with the cold cores of the stars for 2 to 3 milliseconds.

The chemical composition of Pluto and Triton suggests they originated in the same region of the outer solar system before the latter was pulled into Neptune’s orbit

Speaking of Steve Pinker (see previous press), Free Press‘s Michael Moynihan conducted a new 43-minute video interview with the man (below), who of course is writing another book. (I swear, Pinker has future books lined up in his brain, like planes waiting their turn to land.)

Here are the YouTube notes:

In the latest episode of Honestly,Michael Moynihan talks to the Harvard professor and cognitive psychologist Steven Pinker.

Pinker is the author of nine books including Enlightenment Now: The Case for Reason, Science, Humanism, and Progress and Rationality: What It Is, Why It Seems Scarce, Why It Matters. He approaches his work with a kind of data-driven optimism about the world that has set him apart from the chorus of doomer voices we hear so much from in our public discourse.

Today, Michael talks to him about why smart people believe stupid things; the psychology of conspiracy theories; free speech and academic freedom; why democracy and enlightenment values are contrary to human nature; the moral panic around AI; and much more.

The discussion begins with a long back and forth on conspiracy theories. Readers will be interested in Pinker’s comments on “the public health establishment”, whose pronouncements were subject to many conspiracy theories during the pandemic; as well as on the theories behind conspiracy theories.  At 12:15, Pinker expostulates on why smart people believe stupid stuff. It turns out that smart people are less likely than others to believe stuff like conspiracy theories, but they are imbued with one common bias (I’ll let you find out what it is, but it’s a bias we all have.)

The discussion then veers to Enlightenment values, which Pinker thinks are “nonintuitive” but still promote progress in the world by dispelling stuff like “magical thinking” (I think that’s his euphemism for religion).  Then it’s onto AI—its benefits and its dangers—a subject that’s very important but still bores me silly.  Those worried about how AI could harm humanity will find plenty of fodder in Pinker’s speculations, though, at you’ll hear, he’s not that worried about those dangers.

At 35 minutes in, Pinker analyzes why people think that there’s a true genocide in Gaza, something contravened by the known facts; he sees the use of that word with respect to Gaza reeflecting both the “myside bias” as well as constituting a “terrible blood libel.”

At the end the discussion turns to the upcoming election, and Pinker emphasizes our lack of knowledge about what will happen between now and November vis-à-vis the lawsuits, and what Trump would do if he does get inaugurated. (Pinker is a big donor to the Democratic party.) He doesn’t however, think there’s enough “hatred of the establishment to allow a civil war to occur,” but does think we should take measures to prevent one, just in case. His final take-home message: “Rely on data and probabilities.”

The opprobrium that’s heaped on Pinker has always baffled me.  Since his arguments are usually based on facts, then if you disagree with him you can simply refute the facts, which isn’t often done. Rather, he’s attacked as a person, often as a horrible person, and since he’s a nice guy I can assume only that critics are partly motivated by sheer jealousy of Pinker’s intelligence and accomplishments.

As lagniappe, I found this NYT article from four years ago, “How a famous Harvard Professor became a target over his tweets“, which you can find archived here. It turns out that, at least back then, the opprobrium came from Pecksniffs trawling his tweets. I wrote about the undeserved tweet-shaming of that time in a popular post called “The Purity Posse Pursues Pinker.”

An excerpt:

Steven Pinker occupies a role that is rare in American life: the celebrity intellectual. The Harvard professor pops up on outlets from PBS to the Joe Rogan podcast, translating dense subjects into accessible ideas with enthusiasm. Bill Gates called his most recent book “my new favorite book of all time.”

So when more than 550 academics recently signed a letter seeking to remove him from the list of “distinguished fellows” of the Linguistic Society of America, it drew attention to their provocative charge: that Professor Pinker minimizes racial injustices and drowns out the voices of those who suffer sexist and racist indignities.

But the letter was striking for another reason: It took aim not at Professor Pinker’s scholarly work but at six of his tweets dating back to 2014, and at a two-word phrase he used in a 2011 book about a centuries-long decline in violence.

“Dr. Pinker has a history of speaking over genuine grievances and downplaying injustices, frequently by misrepresenting facts, and at the exact moments when Black and Brown people are mobilizing against systemic racism and for crucial changes,” their letter stated.

The linguists demanded that the society revoke Professor Pinker’s status as a “distinguished fellow” and strike his name from its list of media experts. The society’s executive committee declined to do so last week, stating: “It is not the mission of the society to control the opinions of its members, nor their expression.”

Driverless cars seem to have fewer accidents than human drivers under routine conditions, but higher crash risks when turning or in dim light – although researchers say more accident data is necessary

There are many scary claims about excess time on digital devices for children and teenagers. Here’s a guide to the real risks - and what to do about them

Telo-seq -- a new tool -- is bringing telomere science into its modern era. Scientists can finally explore questions about the role of telomeres in aging and cancer that were not accessible with previous methods. The findings will inspire novel telomere-targeting therapeutics for aging-related diseases.

Opera singers have to use the extreme limits of their voice range. Many pedagogical and scientific sources suggest that the highest pitches reached in classical singing can only be produced with a so-called 'whistle' voice register, in analogy to ultrasonic vocalizations of mice and rats. An international research team has now rejected this assumption. In their study, the scientists showed that the high-frequency sounds of operatic sopranos are produced with the same principle than speech and most other forms of singing.

The potential of quantum computers is currently thwarted by a trade-off problem. Quantum systems that can carry out complex operations are less tolerant to errors and noise, while systems that are more protected against noise are harder and slower to compute with. Now a research team has created a unique system that combats the dilemma, thus paving the way for longer computation time and more robust quantum computers.

The potential of quantum computers is currently thwarted by a trade-off problem. Quantum systems that can carry out complex operations are less tolerant to errors and noise, while systems that are more protected against noise are harder and slower to compute with. Now a research team has created a unique system that combats the dilemma, thus paving the way for longer computation time and more robust quantum computers.

Shooting a movie in the lab requires special equipment. Especially when the actors are molecules -- invisible to the naked eye -- reacting with each other. 'Imagine trying to film tiny lava flows during a volcanic eruption. Your smartphone camera wouldn't be up to the job.

In late 2019 the previously unremarkable galaxy SDSS1335+0728 suddenly started shining brighter than ever before. To understand why, astronomers have used data from several space and ground-based observatories, including the European Southern Observatory's Very Large Telescope (ESO's VLT), to track how the galaxy's brightness has varied. In a study out today, they conclude that they are witnessing changes never seen before in a galaxy -- likely the result of the sudden awakening of the massive black hole at its core.

The rise of advanced artificial intelligence (edge AI) could well mark the beginning of a new era for sustainable agriculture. A recent study proposes a roadmap for integrating this technology into farming practices. The aim? To improve the efficiency, quality and safety of agricultural production, while addressing a range of environmental, social and economic challenges.

The newest phase of China’s lunar exploration project is soon coming to an end. On June 20th, the Chang’e 6 sample return mission starts its journey back to Earth from the far side of the Moon, having already collected samples and blasted itself back into lunar orbit. But since a picture is worth a thousand words, let’s look at some of the more memorable images that have come out of this mission so far.

China’s National Space Agency (CNSA) released up close and personal images of the Chang’e-6 landers/ascender system on June 14th. They were taken by a small, autonomous rover that descended from the lander, maneuvered to a suitable position, framed a photograph, and took one, all without input from its human overlords. 

Weighing in at only 5 kg, the rover showed what is possible for autonomous operation with relatively light hardware. It also shows an impressive amount of autonomy for a lunar rover, especially one operational only on the “far” side of the Moon.

Shot of the Chang’e-6 lander/ascender taken by its companion autonomous rover.
Credit – CNSA

It wasn’t the only observer that captured an interesting image of China’s sixth mission in a series named after Chang’e, the Chinese Moon goddess. NASA’s Lunar Reconnaissance Orbiter captured the orbiter from overhead space and showed a dramatic change in its surroundings. 

In the image, the lander itself appears as a bright white dot. However, the surrounding area also appears significantly lighter. This had to do with the blast radius of the lander’s retrograde rockets for its soft landing. Those powerful rockets blew away the dark lunar regolith that had remained untouched for millions of years. The picture was snapped on June 7th, after the Chang’e-6 ascent vehicle had launched back off the surface and rendezvoused with the orbiter that will take the samples it collected back to Earth. In so doing, it likely blew away plenty of material with its own ascent rockets.

During its time on the Moon, Chang’e-6 collected 2 kg of samples, which it will return to a laboratory on Earth. This is the second time CNSA has planned such a mission and the first time one has taken place on the far side that humans cannot see from Earth. 

Fraser discusses the Chang’e-6 mission to collect lunar samples in this news update.

The next in the sequence of Chinese moon missions is Chang’e-7, which will focus its research efforts on the lunar south pole. Scientists predict water ice might be abundant there and that it might be the potential future site of a crewed Chinese moon base. Chang’e-7 will also include a hopping rover to explore the local environs surrounding its lander, but it isn’t scheduled for launch until 2026.

Currently, the Chang’e-6 mission orbiter, which has already successfully docked with the ascent vehicle containing the collected samples, is waiting for the opportune time to return to Earth. It will also serve as the return vehicle, which is planned to land back on Earth on June 25th. If all goes according to plan, there will soon be more lunar samples for scientists to explore and another successful mission for the CSNA that will have been documented in some pretty astounding pictures.

Learn More:
CGTN – Unraveling Chang’e-6: Discover the mini rover that snapped a photo of Chang’e-6 probe
NASA – NASA’s LRO Spots China’s Chang’e 6 Spacecraft on Lunar Far Side
UT – Chinese Probe Collects Moon Samples and Heads for Earth
UT – Chinese Probe Lands on Moon’s Far Side to Collect Samples for Return

Lead Image:
This image from NASA’s Lunar Reconnaissance Orbiter shows China’s Chang’e 6 lander in the Apollo basin on the far side of the Moon on June 7, 2024. The lander is the bright dot in the center of the image. The image is about 0.4 miles wide (650 meters); lunar north is up.
Credit: NASA/Goddard/Arizona State University

The post There’s Chang’e-6 on the Far Side of the Moon appeared first on Universe Today.

Reader Alan Garcia-Elfring, a recent Ph.D. graduate of Montreal’s McGill University (he didn’t have qualms about my using his name) sent along an email from the university President about a rather disturbing Instagram post from the Solidarity for Palestinian Human Rights [SPHR] McGill Instagram site.) The first link goes to the post itself, but I’ve put a screenshot below in case they take it down. Have a gander:

I haven’t dug much further, but it looks as if there’s an encampment at McGill and they’re holding a summer program that seems to turn the encampment into a branch of Hamas.  This has caused a kerfuffle promoted by both the press and the understandably disturbed Jewish community of Montreal. For example, here’s one report from CTV News in Montreal (click to read):

An excerpt:

Pro-Palestinian activists who have been encamped on McGill University’s downtown campus since April launched what they call their own summer school on Monday, despite controversy over photos of armed fighters used to promote the program.

The encampment’s youth summer program promises “revolutionary lessons” and political discussions over the next four weeks, including a series of lectures on Palestinian history, the resistance movement and the role of the media since the Oct. 7 Hamas attack on Israel.

But on Friday, federal and provincial politicians called for the encampment to be dismantled after posters for the summer program were published online featuring photos of Palestinian resistance fighters wearing kaffiyehs and holding rifles. The photos date from around 1970, and the militants appear to be reading copies of Chairman Mao Zedong’s “The Little Red Book.”

“Enough is enough, this is hate speech and incitement to hate, pure and simple!” federal Immigration Minister Marc Miller posted on X. “De-escalation at McGill has clearly failed. This needs to end!”

Quebec Higher Education Minister Pascale Dery said the poster was tantamount to “provocation, explicit incitement to violence, even indoctrination.”

Insp. David Shane of the Montreal police told reporters Monday that while the poster doesn’t target any particular group, “it’s clearly in very poor taste and it’s likely to make people feel unsafe.” He said police have opened an investigation and have “been in contact with the RCMP.”

. . .As of Monday morning, online registration for the summer program had closed. Karim said 50 to 80 people have signed up for the first week of lectures, which will take place every afternoon. Organizers, she added, were surprised by the number of registrants, and may open up more spots in the weeks to come.

Most of the attendees will be students, Karim said. ” 1/8They 3/8 were really interested in the idea of being able to come here and get educated on Palestine.”

Members of the encampment have said they will not leave until McGill ends its investments in companies tied to the Israeli military and cuts ties with Israeli institutions. The university has made offers to protesters, the most recent of which included to review its investments in weapons manufacturers and grant amnesty to protesting students. Members of the encampment rejected that offer, calling it “laughable.”

I don’t know how much of this is considered “free speech” (Canada doesn’t have a First Amendment), nor whether the encampment itself violates university rules. At any rate, the poster and press response got sufficient attention that McGill’s President had to write the following letter to the university community (click to read, though I’ve transcribed the letter below):

Dear McGill community,

On the evening of June 12, a group called Solidarity for Palestinian Human Rights (SPHR) published a notice on social media platforms featuring masked individuals holding assault rifles, which called for participation in a “revolutionary youth summer program” on the lower field next week. Their stated aim is to “educate the youth of Montreal.”

This is extremely alarming. It has attracted international media attention, and many in our community have understandably reached out to share grave concerns – concerns that I share.

It should go without saying that imagery evoking violence is not a tool of peaceful expression or assembly. This worrying escalation is emblematic of the rising tensions on campuses across North America, where we have seen many incidents that go well beyond what universities are equipped to manage on their own.

As such, today we have reached out to municipal, provincial, and federal public safety authorities, flagging this social media post and other recent activities as matters of national security, and requesting all appropriate interventions to ensure the safety of our community.

I want to emphasize that this is only the latest escalation in SPHR’s longstanding strategy of intimidation and fear. This is the same group that described the October 7 Hamas assault and taking of hostages as “heroic.” SPHR has invoked offensive antisemitic language and imagery, and claimed responsibility for the harassment of McGill community members. Their incendiary rhetoric and tactics seek to intimidate and destabilize our community.

In recent months, some members of the McGill community have chosen to advocate for their views through open dialogue and peaceful protest. Regrettably, SPHR is not among them.

Next Steps

• In addition to our appeals to public safety authorities at all levels of government, we will further increase the presence of security staff near the encampment and elsewhere on campus.
• We continue to pursue legal action to bar SPHR from using the McGill name on social media platforms and elsewhere, and we are working with legal counsel to explore a range of additional measures.
• We will pursue internal disciplinary processes.
• We have called upon the Students’ Society of McGill University (SSMU), the independent student union that includes all undergraduate students as members and lists SPHR as an affiliated “club,” to publicly condemn this “summer program,” sever their relationship with SPHR, cease any disbursement of funds to them, and affirm SSMU’s commitment to the well-being and success of McGill students of all identities, beliefs, and lived experiences. We have indicated that, should SSMU fail to take these steps, this will be interpreted as their endorsement of SPHR’s activities.

As a campus community, we need not all share the same views, but it is imperative that we share a common respect for the limits of acceptable behaviour. SPHR’s actions have far surpassed that threshold. We will continue to deploy any and all measures available to us, within the bounds of the law, to keep our community safe.

Sincerely,

Deep Saini

President and Vice-Chancellor

The President is threatening to remove SPHR from being what we at Chicago call a “recognized student organization,” which here gives a group the rights, among other stuff, to use the University name, hold events at the University and get funding. I’m not sure whether that applies at McGill, nor whether the poster above constitutes some kind of violation. But if the encampment violates University rules, blocks off space and creates an atmosphere of exclusion and threat, then McGill might take action. They say they’re pursuing “internal disciplinary processes,” implying that University restrictions have been violated.

There’s a large Jewish community in Montreal (Steve Pinker was part of it and went to McGill as an undergraduate), so of course this is bound to create a fracas. Stay tuned.

In the meantime, the poster by itself seems to me free speech (though unwise speech). But there are those other activities as well as the encampment itself. . . . Weigh in below.

A 19th-century thought experiment that was once thought to defy the laws of thermodynamics has now been realised to make molecules accumulate on one side of a U-bend

Neuroscientist Mayaan Levy has sent in a second batch of photos, which are below. I’ve indented her captions and IDs, and you can enlarge the photos by clicking on them.

Come on, feel the Illinoise!

During my years in Chicago I traveled out-of-state often. I longed for the mountains: the Rockies, the Cascades, the Sierra Nevadas, the Smokies, the Whites (NH) and the Catskills. On busy weekends or when we ran out of money, as it tends to happen to grad students, we would stay home in flat yet wondrous Illinois. Blasting jazz or Sufjan Stevens in my then-boyfriend’s (now-husband) ’99 Chevy Lumina with magenta velvet seats, we’d hope to get somewhere where we would see some nature. Only when we left Chicago I realized how much I miss Illinois woods. This is a small, nostalgic tribute.

Our favorite destination was probably Shawnee national forest, which was quite a stretch for the Chevy. Here are some Shawnee turtles:

Box turtle (unsure whether Terrapene carolina or Terrapene ornata, I believe the latter is considered threatened):

Midland painted turtle (Chrysemys picta marginata) – Illinois State reptile!:

 Common Snapping Turtle (Chelydra serpentina) hanging out on trail:

What I find fascinating about turtles is their brumation: I get it that metabolism slows down considerably like in hibernation, but how do they deal with the anoxia underwater?

Shawnee also has world-class mushroom forging. The place is a mycologist’s paradise. As amateurs, we were always after choice edibles – fry them in butter, add them to risotto, throw them into Chicago style stuffed deep-dish. Despite eating nuts, seeds, fruit and eggs, I find it quite weird sometimes that when we eat mushrooms we actually eat their reproductive organs.

Black morels (Morchella elata). Spotted in early April, they are among the first mushrooms to pop up, and boy, are they tasty. If you’ll be nice in the comments maybe I’ll disclose the exact location. While I’ve been told to never eat morels with booze (you’re welcome to weigh in on this if you know more), I’ve seen many moonshiners and rednecks with beers in hand forage for them:

Pear-shaped puffballs (Apioperdon pyriforme). Edible as well, but when mature the puffballs burst and spray spores right into your face:

We think these are a type of honey mushrooms (Armillaria mellea), but we’re not sure. Please let me know in the comments if you can identify:

An epic chanterelle (Cantharellus cibarius) haul from Shawnee in early July 2020. They are my favorites but they are not fun to clean. Unfortunately, this trip was cut short upon discovering scores of deer ticks on our clothes;

Moving west, the Hennepin canal, nowadays an awesome biking trip, started as an ambitious project to link the Mississippi and Illinois rivers to ship goods. It’s a really interesting piece of history, so here’s the Wikipedia page about it

As for wildlife, if you camp you’d be serenaded by frogs and toads, water birds live around, and mosquitos are unfortunately a problem.

One of the locks on the canal (it has about 30, some of them are still functioning!):

Dusk, right after rain, on the Hennepin canal:

The closest destination, and therefore holds a warm spot in my heart is Busse woods. It has a mini-lake / swamp, and I’ve often seen people there taking photos of birds. As usual, we’re after the food: mulberries, black walnuts, and:

Huge Chicken-of-the-woods spiral (Laetiporus sulphureus), a summer mushroom:

Kankakee river state park is where we’d go to put our feet in the water, look at some pretty conic shells and pretend to be pirates on an epic adventure for an afternoon. Several years ago a new pedestrian bridge was built across the river, resulting in a large pile of debris which is overlooked by most. However, rocks in this pile are rich in fossils. I’m unsure from what period exactly, but I (amateur naturalist) would guess Cambrian / Ordovician when aquatic life flourished and before the first big mass extinction. If you know more about the geology of the Illinois basin, but please share your knowledge.

Some sort of crinoid impression fossil:

Trilobite?: