Ad: Water Screw Perpetual Motion Machine Woodcut Coffee Mug
No need to be a physicist to enjoy this aspiring thermodynamic mug featuring Robert Fludd's 1618 "water screw" perpetual motion machine from a 1660 wood engraving. Mug includes the following title of "Water Screw" Perpetual Motion Machine with the following caption: "Note: There can never be a perpetual motion machine since it would violate one or both of the first & second law of thermodynamics". Make others do a double-take at the earliest concept of a perpetual motion machine with this mug! myPhysics
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