The first 76 people to sign up at https://brilliant.org/stevemould/ will get 20% off an annual premium subscription. You can train yourself to move one eye independent of the other. Here's how to do it. I also talk about the science of eye movement: saccades, smooth pursuit, vestibulo-ocular and vergance. Here's the story about Susan R Barry: https://www.psychologytoday.com/us/blog/eyes-the-brain/200904/how-rewire-your-brain-and-vision Here are brilliant.org's principals: https://brilliant.org/principles/ Twitter: http://twitter.com/moulds Instagram: https://www.instagram.com/stevemouldscience/ Facebook: https://www.facebook.com/stevemouldscience/ Buy nerdy maths things: http://mathsgear.co.uk/