Suction cup
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A suction cup is a device, usually made of rubber or plastic, that sticks to smooth, nonporous surfaces. They are usually used to attach objects together with the use of suction.
Upon pressing the suction cup to a surface, the air pressure inside is drastically reduced. The relatively higher atmospheric pressure forces the cups to stick to the surface.
Suction cups are believed to have first been used in the 3rd century, B.C., and were made out of gourds. They were used to suction viruses out of sick people, and Hippocrates is believed to have invented this procedure.[citation needed]
The modern suction cup was patented in 1882, and is based on the suction cup-like features on octopus tentacles.
They can be used as safety device by climbers of sky-scrapers.[citation needed]fi:Imukuppi
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