Had to stop my brother and take some pictures of the light on his face because it was so fascinating. He could hardly keep back a yawn and so I’ve passed the contagion on to you. In my anthropology class we learned that watching someone yawn triggers the same part of your brain that is responsible for feelings of empathy. As I am a sympathetic crier (and then have to conclude that part of my brain is well-developed), I’ve been yawning the entire time while writing this post! But I hope you’ll forgive my good-natured impishness and enjoy the little study in light I did.