MIT cognitive scientist Deb Roy wanted to study how young children learn language. What better way than to study his own child? Roy installed video cameras in his home and recorded the family's every move for 5 years. Then he analyzed the videos to discover how his son learned words through hearing them in context. Watch as his son learns the word "ball", evolving from just the "buh" sound to the full word.
Read more about this research and see more videos of the family at Fast Company.