The bootstrapping effect here is fascinating: https://en.wikipedia.org/wiki/Vocabulary_development …pic.twitter.com/pDP1W0GdS9
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Reading and more diverse sources of conversation seems to be the conventional explanation.
What I'd like to know is how important is the effect of having an increased "surface area" for learning: the more words you know, the
easier it is to learn new words.
My guess, closely watching two boys of 4 and 7, is less than you'd think.
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