What riddle did the geckos ask scientists and what explanation did scientists give to the unusual abilities of geckos?

The ability of geckos to mix on smooth steep surfaces and even on ceilings is a mystery. The answer is that the surface of the gecko’s fingers is covered with millions of microscopic hairs about 0.002mm long. Each hair at the end is divided into bristles with a thickness of about 0.1 microns These thinnest bristles are easily bent and come into close contact with any uneven and very smooth surface of a solid body. In close contact with the surface, intermolecular forces act.