To keep your he-man jaw muscles from smashing your precious teeth, the only set you have, the body evolved an automated braking system faster and more sophisticated than anything on a Lexus. The jaw knows its own strength. The faster and more recklessly you close your mouth, the less force the muscles are willing to apply.

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About Mary Roach

Mary Roach was a contemporary American author. Mary Roach is an American author specializing in popular science and humor. She has published eight New York Times bestsellers: Stiff: The Curious Lives of Human Cadavers (2003), Spook: Science Tackles the Afterlife (2005), Bonk: The Curious Coupling of Science and Sex (2008), Packing for Mars: The Curious Science of Life in the Void (2010), Gulp: Adventures on the Alimentary Canal (2013), Grunt: The Curious Science of Humans at War (2016), Fuzz: When Nature Breaks the Law (2021), and Replaceable You: Adventures in Human Anatomy (2025). Read more on Wikipedia →

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