"Stephen Pinker has a story about Henry Kissinger and his brother moving to the US just before and after that threshold, one having a German accent and the othe

"Stephen Pinker has a story about Henry Kissinger and his brother moving to the US just before and after that threshold, one having a German accent and the other doesn't." It could also be that one was more motivated to change the accent, or otherwise got more practice, than the other. But never mind that possibility, because Stephen Pinker is a fundamentalist about nativism.