My favorite from What if? (xkcd): 20 miles per gallon ≈ 0.1 mm² https://www.wolframalpha.com/input/?i=1%2F%2820+mile%2Fgallon%29+to+mm%5E2 https://www.wolfram

My favorite from What if? (xkcd): 20 miles per gallon ≈ 0.1 mm² https://www.wolframalpha.com/input/?i=1%2F%2820+mile%2Fgallon%29+to+mm%5E2 https://www.wolframalpha.com/input/?i=1%2F%2820+mile%2Fgallo...