1. Take a raw egg, put the thin end of chopsticks on the egg, drill a hole gently, take out all the egg whites and yolks in the egg, and keep the empty shell for later use.

2. Gently pour an appropriate amount of corn particles into the egg shell by hand; Try the experiment of balancing the grains on the table and pour out the extra corn grains. In this experiment, the effect of sand experiment is the best because the center of gravity is easy to find.

3. Take out the white paper prepared in advance, try to roll a pointed cap without pouring pills and fix it with double-sided tape.

4. According to the diameter of the egg, try to detect the upper part of the pill with scissors, and draw the glasses, mouth and other organs of the pill with a whiteboard to make the tumbler show the color of "life".

Tumbler principle

Sticking plasticine on the bottom of the egg is the reason why the eggshell always returns to its original position without falling off. The plasticine at the bottom of the egg is the heaviest, so this is the center of gravity of the tumbler. The lower the plasticine position, the lower the center of gravity of the tumbler and the more stable it is.

When people push the tumbler, the contact point and center of gravity between the tumbler and the desktop will be different due to external force, which is the reason why the eggshell swings left and right.