Can the egg stand up? What principle? thank you

Principle: When the center of gravity and fulcrum of an egg are on the same vertical line, it can remain stable. However, due to the spherical crowns at both ends of the egg, the center of gravity tends to deviate from the vertical line, which leads to the egg dumping. Therefore, only by providing corresponding supporting structure at the bottom of the egg can the center of gravity of the egg be maintained.

Extended data

There are always more solar terms and customs to harvest. The autumn equinox is no exception. Everyone is familiar with the tradition of "offering sacrifices to the moon" in the Mid-Autumn Festival. In fact, it started from the autumnal equinox, but later, because this day is not fixed and it is in the late August of the lunar calendar, there is often no full moon. In order to avoid offering sacrifices to the moon when there is no moon, people later changed the "Moon Festival" from the "Autumn Equinox" to the Mid-Autumn Festival.

In ancient times, the autumnal equinox had a unique custom. It is to print the annual lunar solar terms on red paper or yellow paper, and then print the patterns of farmers' ploughing fields and send them door to door, which is called "Autumn Cattle Map". Commonly known as "Autumn", Qiu Ren is called "Qiu Guan".

In addition to the above, there is also a simple game called "Vertical Eggs" on the Equinox, which is also called "Vertical Eggs". This kind of game also exists in the vernal equinox and has spread all over the world.

References:

Xinhuanet: Spring Equinox Vertical Eggs!