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Calculating day of the week
I recently saw videos of Arthur Benjaman (the "Mathemagician") and saw him calculate day of the week in 3 seconds given the date and month. I checked out Zeller's congruence and then found an algorithm which isextremely simple.
I have discovered a truly marvellous signature, which this margin is too narrow to contain. -Fermat
Give me a lever long enough and a fulcrum on which to place it, and I shall move the world. -Archimedes
Young man, in mathematics you don't understand things. You just get used to them. - Neumann