Several years ago Deb Roy, a researcher at MIT, set up video cameras in every room of his house to record his son’s life.  (New parents may think this is a great idea for capturing family life.)  This particular experiment, however, became something much bigger.  It led to fascinating in-depth research that explains how we learn and communicate.

In this 2011 TED talk, one of the examples shows how he analyzed over 90,000 hours of video to put together a short audio of his son’s transition from saying “gaaaa” to “water”.