" Botox studies pointed in the opposite direction. Somehow, changes in the body—freezing the face with a neurotoxin—were producing changes in the mind: the ability to feel sadness or empathy. The horse appeared to be steering the rider. And we now know why. Our facial expressions are hardwired5 into our emotions: we can’t have one without the other. Botox lessens depression because it prevents us from making sad faces. But it also dampens our connection to those around us because we feel empathy by mimicking each other’s facial expressions. With Botox, mimicry becomes impossible, so we feel almost nothing at all. "

― Steven Kotler , Stealing Fire: How Silicon Valley, the Navy SEALs, and Maverick Scientists Are Revolutionizing the Way We Live and Work