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In communications newly revealed, TikTok executives discuss being aware of the harms caused by their app. TikTok officials were warned of the app’s dangers to minors.

Valentina Petrillo fell in love with athletics as a 7-year-old while watching Italian sprinter Pietro Mennea win gold in the 200 meters at the 1980 Moscow Olympics. She wanted to be like him.

Boeing's Starliner will return to Earth as soon as next week — but the crew will stay in space into next year. It's another blow for Boeing, and could have major implications for its space business.

All five seats in the San Diego congressional delegation are up for election in the March primary, but political observers do not expect much turnover.

Weighted infant sleepwear companies say their products are safe and help babies sleep, but some medical experts, safe-sleep advocates and government regulators warn the garments could be dangerous.

When marijuana becomes a Schedule III instead of a Schedule I substance under federal rules, researchers will face fewer barriers to studying it. But there will still be some roadblocks for science.

Filmmaker David Leitch says it's easier to do stunts himself than direct his stunt performer friends. "You are responsible for their safety," he explains. "Your heart goes through your chest."

Medical experts in Imperial County link climate and socio-economic status with health care challenges.

New spacesuits, untested astronauts, and a lot that can go wrong make this five-day mission unusually complex, but with a potentially great reward.

The California energy grid is balancing renewable supply while an energy test bed at UC San Diego looks for ways consumers can optimize it.