William Gurstelle is a professional engineer who has been researching and building model catapults and ballistic devices for more than 30 years and is a contributing editor at Popular Mechanics, a columnist for Make magazine, and writes for the Atlantic, Maxim, and Wired. He lives in Minneapolis, Minnesota. Find out more at williamgurstelle.com
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DID YOU KNOW? Marlon Brando hated memorizing lines so much that he posted cue cards everywhere to help him get through scenes.
He even asked for lines to be written on an actress's posterior. (That request was denied.)