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Twitter's head of trust and safety says she has resigned

Twitter's head of trust and safety, Ella Irwin, told Reuters on Thursday that she has resigned from the social media company, which has faced criticism for lax protections against harmful content since billionaire Elon Musk acquired it in October.

This July 9, 2019, file photo shows a sign outside of the Twitter office building in San Francisco. (AP Photo/Jeff Chiu)

Newly discovered stone tools drag dawn of Greek archaeology back by a quarter-million years

Deep in an open coal mine in southern Greece, researchers have discovered the antiquities-rich country's oldest archaeological site, which dates to 700,000 years ago and is associated with modern humans' hominin ancestors. The find announced Thursday would drag the dawn of Greek archaeology back by as much as a quarter of a million years, although older hominin sites have been discovered elsewhere in Europe. The oldest, in Spain, dates to more than a million years ago.

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