The human body is incredible and does things automatically like keeping our heart beating, getting air into our lungs, and digesting our food without many of us noticing what is going on. But like a machine, there are things it does that may feel like it’s a glitch but is actually necessary for the basic functions of the human body.
It’s OK to be Smart is a web series from PBS that helps explain why things are the way they are. In this episode, host and series creator Joe Hanson explains why our eyes sometimes twitch, why we hiccup, why we yawn, and why we sometimes get startled in our sleep. He also explains why some of us sneeze when staring at the sun.
While some of us may worry when these involuntary behaviors happen, Hanson assures us that they are perfectly normal actions. Please share them with your friends and family.