I have done it before, first make a hole in the egg, get out the egg liquid inside, and then fill the eggshell with sand and cement through the small hole, so that the big end of the egg is facing down, about the height of the egg. About 1/5 of the egg, then pour water into the egg to soak the sand and cement inside, wait for the sand and cement to solidify, and the egg tumbler is done. Place it on the table. When the egg shell is at rest, always point the small end upward. Press it with your hand. After letting go, it will rotate back to its original position, shake a few times, and finally rest in its original position.

The principle of the tumbler is very simple, that is, the lower the center of gravity, the higher the stability of the object. When the tumbler is tilted, the line of action of gravity will be biased to the other side of the support point, so gravity will deflect the tumbler to the other side. Without human intervention, it will eventually rest on the same vertical line where the center of gravity and the support point are. location.

In addition, there is also a clown that has never been produced before. Cut a clown out of card, cut a small opening on the clown's head, and fix a nut on each of the clown's hands. Pull a rope horizontally, hang the notch on the clown's head on the rope, and stir the clown with your hand. The clown will pull back and swing, but will not fall. The principle is similar to that of Luo Weng.

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