The secret of tears. There are some tubes in the eyes. There are also crying ducts in these ducts. It is in the corner of the eye. This duct always keeps the eyes wet. During weeding, more water accumulates in this duct. And the water comes out through another drain. This is tears. A kind of bitter gas comes out from onion. When this gas enters the eye, water comes from the eye. Because when something else touches the eye, water comes out of the eye to protect the eye. As a result, the eyes are washed and cleaned. The same thing happens with smoke.