Every spring, the maple seeds spin like helicopters and slide to the earth. In windy days, a seed can even float in the air for a kilometer, and finally land on a strange land to begin its life as a tree.

During the falling process of maple seeds, the rotation of their "wings" will cause air vortices. These vortices will reduce the air pressure above the maple seeds, and their "wings" will also be subject to stronger buoyancy, which can resist the downward gravity and make them stay in the air for a longer time.

Source: @evelyn.shaw