Ever wonder why we pronounce words differently than we did 100 years ago? Dialect coach Erik Singer breaks down four of the most mind-blowing facts we know about human language.

CORRECTION: The scan shown at 4:44 is an ultrasound image, not an MRI. We regret the error.

Check out more from Erik here: http://www.eriksinger.com/

Pirahã language footage courtesy of Daniel Everett

MRI recordings courtesy of the Seeing Speech project, University of Glasgow, Xhosa footage courtesy of Khaya Dlanga, & William Henry Egerton Tilley photo courtesy of the Tilley Family

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