A capuchin monkey in Brazil hoists a stone tool to crack open nuts.
Luca Antonio Marino
Capuchin monkeys in Brazil use big stones to crush the shells of nuts they want to eat. An experiment in the field investigated how these monkeys prepare to use new, unfamiliar tools.
Walter Mario Stein/Shutterstock
A thought experiment from Richard Dawkins' book The Selfish Gene turned out to be a more realistic explanation for altruism than he expected.
Evolution has no final endpoint in mind.
If you go by editorial cartoons and T-shirts, you might have the impression that evolution proceeds as an orderly march toward a preordained finish line. But that's not right at all.
A male guppy looks good when he looks different.
The mating habits of these tiny, colorful fish may be revealing something broader about the animal kingdom, and perhaps even our own desires.
Examining chicken intestines, reading the tea leaves, watching the markets – people turn to experts for insight into the mysteries that surround them.
Hidden forces are always at work in the world, and people always want to control them, a cognitive anthropologist explains. Enter the human universal of shamanism.
We’re having less sex than we used to.
Australians report having sex once or twice a week, on average, but there are many variables. And that's assuming people's estimates are accurate.
Why are humans the only animals with chins?
Yes, we’re still evolving.
Natural selection isn't the only factor deciding human evolution.
The surgical removal of wisdom teeth is far more common than the problems they cause.
When they cause problems, wisdom teeth don't seem very smart. But they may have been evolution's answer to a coarse diet.
Most animal groups adopted their shapes quickly but some kept evolving.
Some of the ‘remarkable beetles’ Wallace collected in Borneo.
A. R. Wallace
An evolutionary biologist visits the remote jungle mountaintop where a little-known naturalist wrote his insightful paper about the mechanisms of evolution that spurred on a rivalrous Charles Darwin.
Birds don’t fly across wide Amazonian rivers like the Rio Negro.
Marcos Amend www.marcosamend.com (for use with this article only)
Rivers are natural boundaries for evolving populations. But scientists don't agree whether they create new species or just help maintain them. Research using birds' molecular clocks provides some answers.
Forest near Sarayaku, Ecuador.
What drives the emergence and disappearance of species? By modeling the fundamental processes of evolution and ecology on geographical scales, new research spotlights topography and climatic shifts.
Neymar in pain. Or is he faking it?
Vocal deception may have played a key role in our progression from primitive nonverbal noises to complex, controlled speech.
WWE wrestler Triple H at a live event in Orlando 2008.
WWE SmackDown Triple/wikipedia
New research on roaring shows that women underestimate their own strength.
New research shows green-blooded skinks have evolved multiple times, which could help lead to explanation as to why.
Negative results are still useful, and should not be hidden.
Questionable research practices are not fraud, and they're not cause for panic. But they do give us some hints about how we can make science more robust.
Watching bacteria and viruses duke it out, evolving to outwit each other.
UC San Diego
A core idea in molecular biology is that one gene codes for one protein. Now biologists have found an example of a gene that yields two forms of a protein – enabling it to evolve new functionality.
More and more evidence shows evolution isn't as random as often thought.
Your voice can affect how attractive, fertile and faithful people think you are.