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myjetpack:

Caption; The physicists’ attempt to unify their theories faltered almost immediately due to a fundamental disagreement on the nature of gravity. Image: A scientist stands before a blackboard upon which is written, upside down, the equation for Newton's law of universal gravitation. “You’ve written it upside down!” he shouts to another scientist who is standing on the ceiling (so that the equation reads correctly to him) and who replies “I have not!”ALT

A recent cartoon for New Scientist.