Did you use a mouse recently? Did you type on a keyboard? Did you click on a link? Connect to a computer network? Odds are, if you’re reading this, you have. You can thank Douglas Engelbart (1925–2013) for all of these inventions and more. In December 1950, Engelbart had it all. He was engaged to be married,  had a good job as a radar technician, and was generally doing well for himself. At this point, he decided that this wasn’t good enough. He decided he wanted to improve the world and that, although they were in their infancy, computers