Ever wonder why we pronounce words differently than we did 100 years ago? Dialect coach Erik Singer breaks down four of the most mindblowing 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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