The Chinese Room - 60-Second Adventures in Thought (3/6) The Grandfather Paradox - 60-Second Adventures in Thought (2/6) Schrödinger's Cat - 60-Second Adventures in Thought (6/6) The Twin Paradox - 60-Second Adventures in Thought (5/6) Hilbert's Infinite Hotel - 60-Second Adventures in Thought (4/6) Achilles and the Tortoise - 60-Second Adventures in Thought (1/6)