Get a hard-boiled egg and place it on the reverse side of a smooth
polished plate or bread-platter. If you now turn the plate round while
holding it in a horizontal position, the egg, which is in the middle
of it, will turn round also, and as the pace is quickened, the egg
will move more and more quickly, until it stands up on one end and
spins round like a top. In order to be quite sure that the experiment
will succeed, you should keep the egg upright while it is being
boiled, so that the inside may be hardened in the proper position.
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