@leadlefthand
OFF TOPIC: Just one criticism to what Thomas Sowell said about learning language: it is a myth that older people can't learn language as good as children. Adults have a difficult time learning language because they learn it through the structure of school, which relies on memorizing vocabulary (word for word), tenses, grammar rules etc. It is an inefficient way to learn language compared to how children learn - listening to actual everyday conversations.
When people talk, there are some words and phrases used far more frequently than others. And when people talk, they usually talk with the grammar in place. So a child listening to the conversations get to instinctively know what sounds right to what doesn't.
Given all that, there are language lessons created where the adult is taught the language the way kids typically learn a language (I think Pimsleur works in that manner). And in this kind of system where learning is based more on phonetics and actual conversations, adults have learned foreign languages far more efficiently than children.
So in this aspect, it is the methodology of teaching foreign language applied in schools that is flawed, rather than the adult person's ability to learn new languages.
Other than that, Thomas Sowell's lecture here is factually superb as always, despite the negativity it attracts from SJWs.