Interactive: How a Toddler Learns to Talk

The MIT Media Lab's Human Speechome Project has collected more than 80,000 hours of video and 120,000 hours of audio recordings documenting the first two years of a child's life. The result is a massive database of parent-child interactions, illustrated in this graphic. Click on any word below to see when the child learned it and how often the child and his parents used it.

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