khanacademy
This week's #AskSalAnything comes from Elliot on Instagram: Do you think #Mars is really the next best settlement for humanity? 🚀🤔 Got a question for Sal? Reply or tweet us #AskSalAnything. pic.twitter.com/xInmAcPHvM
— Khan Academy (@khanacademy) April 27, 2018
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