army1987 comments on Why Are Individual IQ Differences OK? - Less Wrong
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Einstein and Feynman didn't start to talk until they were 3.
Huh. I didn't know that. My parents thought I was deaf until one day I started talking - in full and coherent sentences.
How common is that?
This old Language Log post discusses some fictional, real and apocryphal cases.
I couldn't give a figure for it but it is a common enough occurrence that my Asperger's Syndrome textbook notes it as a possible outcome.
I had originally read that on the WIkipedia article about Feynman, which links to http://en.wikipedia.org/wiki/Language_delay, which cites http://pinker.wjh.harvard.edu/articles/media/1999_06_24_newyorktimes.html (which I haven't read yet, but I'm going to).