We swallow hundreds of times a day without giving it much thought, but swallowing requires a highly coordinated series of movements of the jaw and muscles in and around the tongue. A glitch at any point can lead to disordered swallowing, known as dysphagia. A study backed by NIH's National Institute of Dental and Craniofacial Research imaged monkeys swallowing (as seen in this reconstructed video), revealing surprising new information that challenges current thinking about how swallowing happens