Raw or Cooked?
Explanation: The center of the egg's gravity is the key to this trick. A raw egg's center of gravity is the yolk. Because all of the egg's insides are liquidy, the yolk moves, and the spins are slowed and offset by this. A cooked egg's center of gravity is the yolk too, but since the egg is cooked, nothing moves inside, making it easier for the egg to spin around the center of gravity.
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