Climate
‘Ice Rivers’ invites you to get to know our world’s melting glaciers
In her new book, Jemma Wadham brings readers along on her scientific expeditions to the world’s iciest places.
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Cover Story
Fossils and ancient DNA paint a vibrant picture of human origins
Paleoanthropologists have sketched a rough timeline of how human evolution played out, centering the early action in Africa.
Reviews & Previews
Science Visualized
Animals
Frog and toad pupils mainly come in seven different shapes
Analyzing over 3,200 species revealed that the colorful eyes of frogs and toads have pupils shaped as slits, diamonds, fans and more.
Notebook
Animals
A giant tortoise was caught stalking, killing and eating a baby bird
Video captures the first documented instance of a tortoise hunting another animal.
Features
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Rice feeds half the world. Climate change’s droughts and floods put it at risk
Rice provides sustenance for billions who have no alternative, and climate change threatens to slash production. Growers will need to innovate to provide an important crop as climate whiplash brings drought and floods to fields worldwide.
More Stories from the September 25, 2021 issue
- Plants
A well-known wildflower turns out to be a secret carnivore
A species of false asphodel wildflower snags prey with gluey, enzyme-secreting hairs, leaving a trail of insect corpses on its flowering stem.
- Psychology
‘Ghost games’ spotlight the psychological effect fans have on referees
Soccer teams won fewer games and received more fouls when playing at home during the 2019–2020 season, when many fans were absent, than before the pandemic.
- Life
An incredibly resilient coral in the Great Barrier Reef offers hope for the future
At more than 400 years old, a massive coral off the coast of Australia has endured as many as 80 cyclones and 99 bleaching events.
- Health & Medicine
New studies hint that the coronavirus may be evolving to become more airborne
More coronavirus RNA is in fine aerosols than in larger droplets, but masks can reduce the amount of virus in the air.
- Psychology
Everyone maps numbers in space. But why don’t we all use the same directions?
The debate over whether number lines are innate or learned obscures a more fundamental question: Why do we map numbers to space in the first place?
- Astronomy
New ideas on what makes a planet habitable could reshape the search for life
New definitions of “habitable worlds” could include planets with global oceans under a steamy hydrogen atmosphere or exclude ones that started out habitable but lost all their water.
- Animals
These baby greater sac-winged bats babble to learn their mating songs
Greater sac-winged bat pups babble their way through learning their rich vocal repertoire, similar to how human infants babble before speaking.
- Animals
Female hummingbirds may sport flashy feathers to avoid being harassed
Some female white-necked jacobin hummingbirds boast bright blue plumage that’s similar to males. The colors may help females blend in to avoid attacks.
- Astronomy
Here’s how cool a star can be and still achieve lasting success
The dividing line between successful stars and failed ones is a surface temperature of about 1,200° to 1,400° Celsius, a new study reports.
- Paleontology
This big-headed pterosaur may have preferred walking over flying
The most intact fossil of a tapejarid pterosaur ever found yields new insight into how the ancient reptile lived.
- Health & Medicine
How personalized brain organoids could help us demystify disorders
Personalized clusters of brain cells made from people with Rett syndrome had abnormal activity, showing potential for studying how human brains go awry.
- Animals
Some wasps’ nests glow green under ultraviolet light
Some Asian paper wasps’ nests fluoresce so brilliantly that the glow is visible from up to 20 meters away.
- Health & Medicine
50 years ago, scientists found a link between aspirin use and pregnancy complications
Scientists are still learning about the risks and benefits of taking aspirin at each stage of pregnancy.
