Today on Towel Day let us remember the words of Douglas Adams: “If you want to survive out here, you’ve got to know where your towel is . . . A towel… is about the most massively useful thing an interstellar hitchhiker can have … any man who can hitch the length and breadth of the galaxy, rough it, slum it, struggle against terrible odds, win through, and still knows where his towel is, is clearly a man to be reckoned with.”