In the setting of a variety show, Nurb sings onstage about human teeth. He goes through the progression of how they grow, when they are lost, and when wisdom teeth come in. He chirps about the different types of teeth and what roles they...

While our outsides are mostly symmetrical, our internal organs aren't. Why would this be the case? Are other animals the same? What determines if your organs are on the "correct" side or backwards? Here's a video that answers these...

A hypnagogic jerk, or hypnic jerk, is when you startle yourself awake just as you are drifting off to sleep. The video describes what a hypnic jerk is, how common they are, and who typically experience them. Viewers are offered two...