Stem cells are revolutionizing disease study and treatment.
A new study shows that primates' precision grip evolved more than once.
Vietnam's threatened, still-mysterious biodiversity gets a conservation connection.
Clues to endurance running and other unique human traits.
The delta's levees are no match for a big earthquake.
A feast before its time.
A predator returns - and reverses decades of aspen decline.
A digital landscape of the American Southwest.
How have humans altered Earth's land surface? See it via satellite.
An "extended family" once lived by Kenya's Lake Turkana.