The Most Famous Human Lie Detector
Haunted by the death of his mother, Paul Ekman was driven to become the world's premier expert on emotions. Here is his life story
More evidence the brain can detect gut bacteria
About receptors that recognize germ waste; muons that can make out mini-tsunamis; and plants can up their photosynthetic game
When giant millipedes walked the Earth
The fossil of Arthopleura, an invertebrate that could tower over a modern human, shows how the giant bug thrived for 45 million years
The butterfly countereffect
More rain in Africa means more painted ladies make it to Spain
Dark matter, that galactic drag
Invisible, nearly undetectable, it still manages to slow down the movement of metal-heavy stars