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The way time ticks forward in our universe has long stumped physicists. Now, a new set of tools from entangled atoms to black holes promises to reveal time’s true nature

Solar geoengineering could halve the economic cost of climate change, but stopping it would cause temperatures to rebound sharply, leading to greater damage than unabated global warming

Columnist Helen Thomson investigates the neurological benefits of saunas, and how heat therapy can have anti-inflammatory effects throughout the body

Despite its small size, Mars seems to have a huge impact on the orbital cycles that govern Earth’s climate, especially those that cause ice ages

A drug that kills cancer cells by puncturing them comes with an additional benefit: tests in mice suggest it reduces the growth of pain-sensing nerves around tumours

An “epigenetic” adaptation could prevent large numbers of loggerhead turtles from hatching as female due to climate change – a threat that was feared to lead to population collapse

Whether it be singing, dancing or crafting, engaging in the arts is good for our health, and we're beginning to understand how this behaviour affects our biology

Two extremely damaging crop pests have interbred to create hybrids resistant to more than one pesticide that could cause serious problems in many countries

The company’s mega-constellation is having to perform a huge number of manoeuvres to prevent a collision in Earth orbit

Your chronological age can’t always tell you the state of your health, which is why biological clocks have been developed to show our risk of developing diseases or dying – but they’re not all they are cracked up to be, says columnist Graham Lawton

Many species of fungus across the world produce psilocybin, a chemical with psychedelic effects in humans, but its evolutionary purpose may be to deter mushroom-munching insects

A 5500-year-old genome recovered from human skeletal remains in Colombia may give insights into the early evolution of syphilis and its relatives

A distinct set of microbes has been identified in people with obesity, which might help spot and treat the condition early – but whether it is a cause or effect of the condition isn’t known

Long thought to have walked bipedally, like us, Australia’s extinct giant kangaroos have features that indicate they could also have bounced

A trial will finally reveal whether limiting the time teens spend on social media really does affect their mental health

Donated placentas can be processed into thin, sterilised sheets that are packed with natural healing substances and reduce scarring when applied to wounds

A striking shot of biting flies on the head of a crocodile is among the winning entries in the British Ecological Society’s annual Capturing Ecology photography competition

Women using frozen embryos as part of their IVF treatment can either choose to use a medicated cycle or their natural one to prepare their uterus for a pregnancy. Now, scientists have found that the latter option seems to carry fewer risks

Photographer Frédéric Noy's shots give an insight into life around the rainforests of Udzungwa Mountains National Park – and efforts to protect it

From smartphones to net zero, there has been no shortage of innovative ideas in the past 25 years, which is why we have taken a look back to choose the best