Although both are made from petroleum jelly, only one of them has potentially explosive material.

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In the early days of speed-cubing the 1980s pioneers first pried open cubes, sanded corners and greased joints with globs of petroleum jelly to allow faster, smoother moves.

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Each had a patch of skin on one arm shaved, marked with a pen and surrounded by petroleum jelly (to fence the bed bugs in), and a commensurate patch on the other marked and surrounded, but not shaved.

ECONOMIST: Body hair