She was just thirteen years old when my grandmother last saw her parents at Auschwitz. On Holocaust Remembrance Day, it's worth pausing to reflect on how our species led my grandmother to find herself in such a horrific place, and how it might have been avoided.
Humans, chimps and other primates have all been shown to be susceptible to contagious yawning. Previous research has suggested that dogs are, too, unless — according to newly published findings — that dog is a puppy younger than seven months.
This video, by vsauce, not only explains why yawning is contagious, but also lays out the physiology of yawning, reveals that you're less likely to yawn when your brain is cool, and gives us some delightful clips of parakeets yawning.
Just like humans, chimpanzees yawn when they're bored or sleepy, and they also yawn contagiously when they see another chimp do it. That discovery could help unlock the secrets of human empathy.