How potatoes sense up and down

Do you ever wonder if a listener question comes from a celebrity? Why are most metals gray?  Why does holding a baby silence the worry? How do you decide what to do after school? Can moles convert CO2 to Oxygen? How do you deal with grief? How do potatoes know which way is up? …Hank and John Green have answers!

If you're in need of dubious advice, email us at hankandjohn@gmail.com

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