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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

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
Social Sciences
Longitudinal survey finds little evidence that social tech predicts life satisfaction in adults
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
Earth Sciences
North Korea's nuclear testing may have triggered hundreds of earthquakes over several years
Condensed Matter
Stacked 2D materials reveal room-temperature multiferroicity and voltage-controlled magnetism
Nanophysics
New thermal insulator outperforms any material found in nature
Astronomy
From the start, the solar system chose fire over ice to build its first bodies

Q&A: What dinosaur teeth reveal about diet and evolution

What did dinosaurs eat? Teeth provide important clues to understanding the ecology of dinosaurs, which became extinct approximately 66 million years ago. Their shape, structure and patterns of wear can help scientists reconstruct ...

Caught right-handed: Mystery of coiling snake embryos explained

An international team led by Canadian researchers has found evidence explaining why snake embryos form a curious spiral. This ability to coil as embryos enables snakes to hatch with the longest bodies of all vertebrates.

Parental care can influence evolution, beetle experiments show

How has offspring dependence on parents evolved over the course of evolution? Researchers at the University of Bayreuth, in collaboration with Kyoto University, Japan, have investigated one possible mechanism by studying ...

XY or ZW? Gecko chromosomes reveal evolution's hidden playbook

Why do humans rely on XY chromosomes to determine sex, while birds use ZW—and many reptiles use neither, letting temperature decide instead? Sex determination is remarkably diverse across the animal kingdom. In genotypic ...