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Pencil animation: a library book open to SPECIAL RELATIVITY with the Lorentz transformations, then THE TWIN PARADOX with its spacetime diagram, then a note: the one who stays ages faster! Two 80s kids at a library table dare each other to try it, ride their bikes to a dead end where a flying saucer waits, sync their digital watches at 07:00:00, and one flies off. The other is left alone at the dead end with his walkie-talkie: ...over?