Marvel superhero film “Thor: Ragnarok” premiered in Los Angeles, California, US.
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A shooting took place at YouTube's headquarters in San Bruno, California.
Naturalists Chris Atkins and Michael Taylor discovered the world's tallest tree in Redwood National Park, California.
Two rival driverless taxi companies were given approval to operate 24/7 in San Francisco, California.
Hoover Dam began producing electricity and transmitting it to Los Angeles, California.
University of California scientists found evidence that life on Earth probably began 4.1 billion years ago.
