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May have 30 million more words if you're a higher income family than the lower income family. i mean 30 million more words, it's extraordinary that kind of difference. >> right. >> you can even chart the differences as young as 18 months. >> yes. now, the 30 million more words isn't the child's vocabulary. >> what they have even been exposed to. >> what they've heard. a child may be in a rich language environment, television's always on, lots of siblings, lots of adults around. so one of the things we did was to make 12-hour recordings in the home, the child wears a little recorder right here....

Rich families and poor families, basically, following up on that classic study by hart and risley years ago, showing the so-called 30 million word gap. that's kind of become a buzz word. but when we look across these broad groups, from a socioeconomic perspective, in terms of income and education, we find that within richer families, and within poorer families, there's incredible variability, a difference in how much parents engage with their children. it's not the s.e.c. or socioeconomic status is destiny, those differences are there. with the more advantaged families having all those gadgets...