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.
New research suggests life on Earth became more diverse because of a change in biology related to stem cells, not just rising oxygen levels.
Super-black feathers on these guys are like looking into a dark cave.
Male Birds of Paradise have patches of super-black plumage that absorb 99.95 percent of light. New research identified their feathers' microscopic structures that make them look so very dark.
Is this how we got the sperm and the egg?
An ancient sexual conflict over mitochondrial inheritance may be responsible for the evolution of the two sexes as we know them.