Yawning ??? you must be familiar with yawning, do not know my friends why we can yawn ??? is it because we stay up late ?? or because we are allergic ?? hahaha it is all the myth of our society in indonesia. Here I want to explain a little about why we can yawn.
Someone evaporates it due to lack of oxygen in the brain, so when the Oxygen is less then our brain so tired to think so kuta evaporate. The solution for us to be refreshed is to drink a glass of mineral water, and after that we become healthy and fresh again.
Secret of healthy life is drinking more water...