Taking a bath is a very common thing. However, Professor Shepiro, the chairman of the Department of Mechanical Engineering at the Massachusetts Institute of Technology in the United States, keenly noticed that every time the bath water is drained, the vortex of the water always rotates counterclockwise. Why is this? Shepiro clung to this question mark and conducted repeated experiments and research. In 1962, he published a paper arguing that this kind of vortex is related to the rotation of the earth. If the earth stopped rotating, this kind of vortex would not be produced. Since the earth keeps rotating from west to east, and the United States is in the northern hemisphere, the bath water will flow in the opposite direction. Rotate clockwise, and the typhoon in the northern half also rotates counterclockwise. The reason is the same as the whirlpool of bath water. He also asserted that if in the Southern Hemisphere a whirlpool of bathwater would spin clockwise, at the equator no vortex would form. His insights aroused great interest among scientists from various countries. They conducted experiments in various places, and the results proved that Shepiro's conclusion was completely correct.

Nothing is unique. More than 60 years ago, a biologist named Michelson discovered that there was a kind of earthworm in the east coast of the United States and the west coast of Europe at the same latitude, but there was no such earthworm on the west coast of the United States. why is that? This question attracted the attention of German geologist Wegener, who was studying the origin of continents and coasts at the time. Wegener believed that the tiny earthworm had limited mobility and could not cross the ocean. Its distribution just showed that the European continent and the American continent were originally connected together, but later split into two continents. He included the geographical distribution of earthworms as one of the examples in his famous book "The Origin of Continents and Oceans".