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Why high levels of the amino acid cysteine are toxic to cells

Cysteine is one of the main building blocks that cells use to make proteins. But this amino acid is a double-edged sword—too much cysteine is toxic to the cell. Cells therefore keep free cysteine levels to a minimum, converting ...

Endurance running or endurance diving—which came first?

A new study combines paleoanthropology and diving physiology to address a fundamental question in human evolution: Why did humans evolve their exceptional aerobic endurance? Did our ancestors begin endurance running to exhaust ...

Bone strength study reveals new clues about human evolution

Bipedalism, or walking on two legs, is one of the key features that distinguishes humans from other apes. But when and why our ancestors transitioned from a life often spent in trees to a life spent almost exclusively on ...

Chimpanzees give youngsters the tools to learn tricky techniques

Two-thirds of a century after Jane Goodall observed "David Greybeard" break off a twig to fashion a fishing rod for termites, researchers following in her footsteps have found that adult chimpanzees in Senegal literally hand ...

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Evolution
A fossil feather preserved inside dinosaur poop could help explain why birds survived the mass extinction
Evolution
Fossil flowers of ancient lianas preserved in amber reveal the evolution of tropical rainforests
Evolution
'Peculiar' new species of Jurassic squid found in Wyoming
Plants & Animals
How sex with multiple mates can help save species from extinction
Plants & Animals
The 'costly son' hypothesis: Why bigger sons may make births riskier across species
Plants & Animals
New insect genus and four species named for Taylor Swift and her albums
Evolution
New AI model for DNA learns from evolution to unlock secrets of the human genome
Evolution
Fossil ribs reveal new secrets about ichthyosaur swimming technique
Evolution
'Heel-strike' may have allowed early humans to walk farther—at the cost of high-impact forces
Evolution
Reconstructed ancient protein maps how bacterial enzymes evolved distinct functions
Plants & Animals
Decades-old museum specimens reveal 10 extraordinary new worms
Evolution
Self-processing brain systems show both conservation and reorganization across primates
Evolution
The extinct American 'cheetah' was not a cheetah after all
Evolution
Not a cheetah: Ancient DNA reveals the surprising Arctic life of extinct North American cat
Evolution
Tiny fossils reveal big insights about ant ancestors
Evolution
Early mammals weren't all loners—some may have lived in pairs alongside the dinosaurs
Plants & Animals
How an unassuming wildflower thrives in salt-laden air that kills other plants
Plants & Animals
Pigment found in beets linked to plants' adaptation to harsh environments
Evolution
Metabolic networks provide clues about the earliest stages of enzyme evolution
Evolution
Peacock-like displays outpace antlers and tusks in evolutionary change, model suggests

Other news

Planetary Sciences
Earth's chorus waves show limited link to rapid electron loss from radiation belts
Cell & Microbiology
A single temporary stimulus may redirect cell fate without permanently altering genes
Plants & Animals
The mosquito's transition from vegan to bloodsucker explained
Mathematics
What billiard balls reveal about computers and the limits of prediction
Biotechnology
AI model predicts peptide bitterness and enables novel flavor design
Astronomy
Largest dataset of its kind could clarify how massive stars shaped early galaxies
Astronomy
Astronomers detect radio signals coming from an exoplanet for the first time
Analytical Chemistry
Microcrystal electron diffractometer brings hidden hydrogen into focus
Earth Sciences
Briny 'death pools' hold clues to early life
Earth Sciences
Emissions from the past decade have made Europe's recent heat waves worse
Bio & Medicine
Gold nanoplasmonic chip tracks L-DOPA response in Parkinson's 'mini-brains'
Quantum Physics
Quantum protocol securely verifies a device's position using stations 2 km apart
Cell & Microbiology
Bacteria-killing polymers—a new class of antibiotic?
Nanophysics
Carbon nanotube foams reveal a new kind of mechanical memory
Astronomy
Milky Way's first microblazar may produce fastest particles in the galaxy
Analytical Chemistry
Iron complex breaks down stubborn pollutant using light-powered reaction
Ecology
Hot spring amoeba breaks record for heat tolerance of complex life
Astronomy
A 42-light-year X-ray tail links a pulsar to previously 'orphan' gamma rays
Archaeology
A tiny chariot fitting reveals Egyptian glass reached Iron Age Britain
Plants & Animals
Newly discovered orange killifish in the Brazilian Amazon may already be endangered

What made trees possible? New research points to drought

A study is reframing a fundamental question in plant evolution: What made trees possible? Researchers from Cal Poly Humboldt, Yale University, the University of Hohenheim in Germany and the Czech Academy of Sciences set out ...

The invasive fern that science misidentified for decades

Salvinia molesta can double its biomass in 36 hours. It spreads across ponds, lakes and slow-moving waterways in a smothering green mat, blocking sunlight, consuming oxygen and collapsing the ecosystems beneath it. Now present ...

Camouflaging snails change color in the rain

How does a stripy tree snail hide from hungry birds? The Hypselostyla camelopardalis from the Philippines and Reinia variegata from Japan have both evolved a form of dynamic camouflage to survive. Their light-colored patterns ...

Childbirth is not uniquely difficult to humans

The tight fit of a baby's head through a mother's birth canal, which causes great difficulty in childbirth, is not unique to humans, as previously understood. Instead, some small-bodied primate babies have heads almost twice ...