384: A Martian Ocean

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How do you stop caring whether people like you? Why does my shower set off the smoke detector? Why would a 21st century suburban high school have to test for tuberculosis? Should I wash my eyes? Can a solar sail tack against solar wind? Has humanity peed an entire ocean yet?  Hank and John Green have answers! 
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384: A Martian Ocean

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384: A Martian Ocean
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