400: For Those Who Are Still Listening

Why do Hank and John keep things PG?  Why are white sheets the standard ghost costume?  How will computers deal with dates beyond the year 9999?  If the president was allergic to peanuts, would the White House become a peanut-free zone?  In the Garfield comic strip, can John understand what Garfield is thinking? …Hank and John Green have answers!

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