View full lesson: http://ed.ted.com/lessons/deb-roy-the-birth-of-a-word MIT researcher Deb Roy wanted to understand how his infant son learned language -- so he wired up his house with video cameras to catch every moment (with exceptions) of his son's life, then parsed 90,000 hours of home video to watch "gaaaa" slowly turn into "water." This astonishing, data-rich research has deep implications for how we learn. Talk by Deb Roy.