In 1939, Albert Einstein and Leo Szilard co-wrote a letter to U.S. President Franklin D. Roosevelt, explaining that the discovery could be made into a powerful weapon, and that Nazi scientists likely ...

Leo Szilard was waiting to cross the road near Russell Square in London when the idea came to him. It was 12 September 1933. A little under 12 years later, the US dropped an atom bomb on Hiroshima ...

A new regulation may ban independent climbers on all Nepal's 8,000m peaks, including Everest. As of this fall, everyone must use a local guide.