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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
'Peculiar' new species of Jurassic squid found in Wyoming
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
Evolution
When biology inspires mathematics: Hidden symmetries explain why widely used evolutionary methods can give false answers
Evolution
Ancient fossil from China reveals animal‑microbe partnerships dating back 550 million years
Evolution
Seven new species show 250-million-year-old marine group is still evolving

Other news

Optics & Photonics
Photonic Legos of functional 3D thin-films unlock high-performance heterogeneous photonic integration
Environment
Children born today in Europe will live through almost twice as much extreme fire weather as their grandparents
Cell & Microbiology
AI-powered barcode unmasks 'zombie cells' in aging tissue
Cell & Microbiology
Genes that help flatworms regenerate their brains revealed
Social Sciences
Longitudinal survey finds little evidence that social tech predicts life satisfaction in adults
Earth Sciences
Tiny beach-dwelling crustaceans are big-time sand movers, shaping the California coast
Archaeology
'Rusty treasure' find revealed as Europe's largest assemblage of prehistoric iron bars
Planetary Sciences
Venus ate its moon: How Earth's 'twin' could have swallowed a rocky satellite
Cell & Microbiology
Virtual cells built from 4D AI models and 'digital twins' could speed up drug discovery
Condensed Matter
Two-color light steers electrons through graphene's transient topological state
Archaeology
The monsters that weren't: Dinosaur and tusked-beast claims in San rock art unravel
Environment
Global population dataset uses buildings to reveal people's daily movement patterns
Cell & Microbiology
How the malaria parasite boosts its transmission potential under stress conditions
Molecular & Computational biology
Loss of Y chromosome in men could be an early warning sign of cancer
Plants & Animals
A molecular bridge connects two signaling pathways critical for pollen development
Astrobiology
Scientists simulate cosmic crashes to test whether icy moons gain or lose their ability to sustain life
Molecular & Computational biology
Protein map reveals how red blood cells rapidly adjust to low oxygen
General Physics
Physicists extend the search for quantum black holes at the LHC
Earth Sciences
Greenland's Qaanaaq Ice Cap has lost enough ice to produce a layer of water about 8 meters deep
Archaeology
Medieval Chinese skeleton may reveal first evidence of a brutal punishment

Decades-old theory for how insect societies evolve challenged

For more than 60 years, evolutionary biologists have debated whether a unique genetic system found in ants, bees and wasps helps explain one of nature's most remarkable innovations: eusociality, a form of social organization ...