Scientists Looking For Invisible Dark Matter Can't Find AnyScientists have come up empty-handed in their latest effort to find elusive dark matter, the plentiful stuff that helps galaxies like ours form.
Viral Video: What Is The Universe?What is the universe? This video tackles this complex question using the principles of physics.
Stephen Hawking To Turn 70, Defying DiseaseBritish scientist Stephen Hawking has managed to survive with a crippling disease. The physicist and cosmologist was diagnosed with Lou Gehrig's disease when he was a 21-year-old student at Cambridge University. Most people die within a few years of the diagnosis. On Sunday, Hawking will turn 70.

Watch & Listen LIVE