News
- Humans
Stress turns hair gray by triggering the body’s fight-or-flight response
A study in mice finds stress responses deplete cells that give hair its pigment, making the strand white.
- Earth
Fed by human-caused erosion, many river deltas are growing
Deforestation and river damming are changing the shape of river deltas around the globe.
- Genetics
Ancient kids’ DNA reveals new insights into how Africa was populated
Four long-dead youngsters from west-central Africa have opened a window on humankind’s far-flung African origins.
- Animals
Collectors find plenty of bees but far fewer species than in the 1950s
An analysis of global insect collections points to a major collapse in bee diversity since the 1990s.
