Men assess potential rivals that have a larger penis as more of a threat, both physically and sexually, according to a study by Upama Aich at the University of Western Australia and colleagues, ...

Scientists question whether alarming reports of plastic particles in human organs are accurate or the result of laboratory contamination.

“Marine ecologists have focused on competitive and predatory interactions while neglecting positive interactions," said Andrew Barton, a marine ecologist at Scripps and the study’s senior author. “Our ...