Radioactive materials are found naturally in the Earth. But even so, saying an area is radioactive can conjure up images of ...

Researchers have systematically detailed, step by step, how cognitive maps form in the brain's hippocampus -- a region responsible for learning and memory.

HIV is spread by bodily fluids such as blood, breast milk or semen. It gradually weakens the body’s immune system and makes ...

In a politically and emotionally precarious world, where people seem to have stopped caring for ... Subscribe now to get unlimited access to TIME.com and more! President Trump says he’s helping ...

In fiction, The Twilight Zone is the middle ground between light and shadow, between science and superstition, between the ...