I think Lloyd well summarised his thoughts about this in one of his
more recent notes.
Certainly I have no way of feeling velum closure so there must
indeed be two kinds of people if half (?) the population can. One thing
I know for a fact is that only 50% of people can fold their tongues
vertically and hold it folded with their top teeth, so there are certainly
major muscle differences in the tongue. So that makes four. I won't
mention that Caucasians have yellow ear wax and orientals have black.
Regards Reg.
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