Facebook has lost nearly $50B in market cap since Friday; 129M+ shares of Facebook stock changed hands on Tuesday, its biggest trading day since 2014 (Rani Molla/Recode)

Rani Molla / Recode: Facebook has lost nearly $ 50B in market cap since Friday; 129M+ shares of Facebook stock changed hands on Tuesday, its

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NASA astronaut Scott Kelly — whose DNA changed after a year in space — talks about his underachieving childhood, his identical twin and fellow astronaut brother, and how leaving Earth changes people for the better

Retired NASA astronaut Scott Kelly had four missions in space, including a 340-day trip aboard the International Space Station in 2015-2016. On our “Success” podcast,

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