Chris has been watching math videos (huh?!), so I tuned in for a few, including this video introducing differential equations. They’re really easy to watch, follow, and learn from, and the instructor is an absolute delight. It’s impressive to see lessons that are considered ‘upper level’ math presented with such ease and in such manageable… Continue reading

Believe it or not, these are old images in which Guillaume Duchenne was attempting to find the perfect smile through electrodes targeted at specific muscles. He articulated this quest: The “Duchenne smile” is a genuine one, one that seems happy and friendly. It’s the result of two different groups of muscles working together. Cheek muscles turn… Continue reading