Add Yahoo as a preferred source to see more of our stories on Google. By some measures, Sal Khan is the most influential math teacher in U.S. history. The 46-year-old entrepreneur and former financial ...

A wave of speculation has circulated on social media and in various news outlets claiming that Pakistan has leaked nuclear secrets again, allowing Saudi Arabia to build its own atomic arsenal. The ...

More than two years ago, Pakistani scientist A.Q. Khan confessed and apologized for passing nuclear secrets to North Korea, Libya and Iran. Since then, he has been under house arrest. A dozen of his ...

Former CIA official James Lawler has revealed new details on why Pakistan’s nuclear scientist A.Q. Khan was widely known as the “Merchant of Death.” Lawler explains how Khan built an extensive global ...

WASHINGTON, Sept. 11 (UPI) -- Dr. A.Q. Khan, the father of Pakistan's nuclear bomb, notoriously anti-American and arguably the most popular man among 200 million Pakistanis, is the head of a recently ...

(Adds more details) WASHINGTON, Jan 12 (Reuters) - The U.S. State Department said on Monday that it had slapped sanctions on 13 individuals and three private companies because of their involvement in ...