Ahead of OpenAI CEO Sam Altman’s four days in exile, several staff researchers wrote a letter to the board of directors warning of a powerful artificial intelligence discovery that they said could threaten humanity, two people familiar with the matter told Reuters.

U.S. scientists have achieved net energy gain in a fusion reaction for the second time since December, the Lawrence Livermore National Laboratory said on Sunday.

A fresco that depicts what might be an ancestor of the Italian pizza has been found on the wall of an house in the ancient Roman city of Pompeii, Italy's Culture Ministry said on Tuesday.

Tesla Inc will open part of its U.S. charging network to electric vehicles (EVs) made by rivals as part of a $7.5 billion federal program to expand the use of EVs and cut carbon emissions.

Rapid advancements in China’s military capabilities pose increasing risks to American supremacy in outer space, the head of the United States military’s space wing said on Monday.