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OpenAI CEO Sam Altman takes the stand to defend his company against a lawsuit brought by Elon Musk.

One of the most significant people in Sunita Kramer's life is a stranger whom she has never met. She encountered them the same day she almost lost her 7-year-old daughter.

NASA has assigned astronauts to the first mission to bring humans to lunar orbit since the Apollo program more than a half century ago.

With cases growing quickly abroad, the federal government announced several measures to prevent the new coronavirus from taking hold in the U.S.

Studies are underway to determine how the COVID-19 pandemic has impacted the development of babies and young children — and in particular their microbiomes.

NASA has decided it's going to pursue parallel missions to attempt to retrieve samples of rock on Mars collected by rovers.

The 65-year-old Cook will turn over CEO duties to Apple's head of hardware products, John Ternus, in September. Cook will remain with the company as executive chairman.

On Tuesday, President Trump announced his plan for Middle East peace alongside Israel's prime minister — and without any input from Palestinians.

In his new book Pizza Quest, Peter Reinhart describes his spiritual obsession with what he calls "the ultimate comfort food."

Electric bikes are catching on. But damaged or improperly charged batteries can explode and cause deadly fires, as has happened repeatedly in New York City. Officials are searching for solutions.