Here is a new TED talk from Deb Roy, a speech acquisition researcher at MIT. Here, he explains five years of intensive recording inside his home, with the goal of gathering real data about the way an infant (in this case, his son) learns to speak. If you have a baby at home, or are interested in the origins of our ability to learn language, I think you'll find this very interesting!
P.S. This post is dedicated with love to Socrates, Ioanna and Euclid, three of the most expressive people I know.