Conservation helps, but more must be done to reverse the decline of vertebrate species.
Does a shroud of energy from the Big Bang bear scars of other universes?
Another human species was alive at the time of Neanderthals.
For many vultures, scavenging has become dangerous business.
Astronomers propose a new theory to explain Saturn's unusual rings.
Volcanologists keep wary watch on Sicily's restless peak.
A huge galactic smash-up may have formed the galaxies nearest us.
The key to defeating tuberculosis may lie in its longevity.
Use of nitrogen fertilizer is radically impacting Earth's nitrogen cycle.
Astronomers say a black hole recently formed in a nearby galaxy.