A global teacher of 1,516 lessons and counting

From a tiny closet in Mountain View, Calif., Sal Khan is educating the globe for free. His 1,516 videotaped mini-lectures -- on topics ranging from simple addition to vector calculus and Napoleonic campaigns -- are transforming ...

Study Shows How We Evolved Different Personalities

(PhysOrg.com) -- Although members of the same species share more than 99 percent of their genetic makeup, individuals often have small differences, such as in their appearance, susceptibility to disease, and life expectancy. ...

Scientists weigh in on Stephen Hawking's alien warning

Famed physicist Stephen Hawking set off chatter in late April when he posited the existence of intelligent aliens on his new TV series, "Into the Universe with Stephen Hawking" -- adding that it would be best for human beings ...

page 5 from 40