"The discovery of HIV, a breakthrough in the treatment of bi-polar disorder, the advent of the contraceptive pill… CNN.com takes a tour of through some of the scientific discoveries that changed the world."

"On a pilot voyage, through the Sargasso Sea in the North Atlantic, scientist J. Craig Venter has found more than 1,800 new species of bacteria and viruses—a surprise, since he had always thought of the Sargasso as a biological desert, relatively devoid of life."

"If legendary inventor Ray Kurzweil is right, the future will be a lot brighter - and weirder - than you think."