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How Your Child Learns Language, Captured In An Amazing 40-Second Clip

Need a visceral reminder that your kid’s babbling is part of a crucial long-term process and not just nonsense designed to annoy you? Cognitive scientist Deb Roy wired his home like a Las Vegas casino to track the development of his son’s capacity for language, amassing 90,000 hours of footage over two years.Skip to 4:30 in this TED Talk video to hear a 40-second audio timelapse of Roy Jr’s “gaaaa” blossom into “water” — one of 500 words he was able to speak by his second birthday, including the phrase “Um, Dad, why are there cameras on my ceiling?”