Jennifer Welsh

A day of pranks helps humans bond, scientists say.

Warmer temperatures and high oxygen concentrations fueled wildfires.

The virus takes over the mosquito's sensory organs, making them a disease-spreading machine.

Bushy "Teddy Bear" sunflowers featured in Van Gogh's paintings are a genetic mutant, and other varieties might have a genetic basis as well.

Mutations turn the perfect bloom into a Teddy Bear.

Ancient raindrops tell us about ancient Earth

College students and truck drivers beware: Stimulants turn hard working rats into slackers.

Fossilized poo samples yield ancient hyena DNA and the DNA of their food

No, not in the hippy-dippy commune sense.

Instead of living in the chilly Arctic like its modern cousins, this ancient whale lived in warmer waters.

Fatty diets make brain regions break out with new brain-cell growth.

Zoo diet keeps the lady rhinos trim, but it may be messing with their baby-making abilities.

A giant prehistoric snake invades Grand Central

A 2,500 pound, 48 foot long prehistoric snake invaded Grand Central

We can't all be picky about mates.

A new analysis of an 1886 painting enabled researchers to attribute it to Vincent van Gogh.

Loss of Australia's 10-foot kangaroos and rhino-size wombats led to changes in landscape and wildfire outbreaks.

Antarctic seal pups may not have the energy to learn foraging skills or grow healthy.

Smaller, smellier bites may lead to less food eaten, and smaller bellies.

Social learning of calls in primates was seen as unique to humans.

A small, perhaps unintended, ocean crossing dropped these founders on the island.

People with more working memory can stay on task, even when thinking about other things.

Mouse Viagra? Try an extra X chromosome.

Some people are more susceptible to memory loss after drinking, because their brains just can't take it, researchers say.

Alcohol replaces the "happy" brain chemicals usually created by sex.