Race and malaria

>On the ability to resist malaria. ...snip...The appearance
>and spread of the sickle-cell allele is more likely to have begun 10-20
>thousand years ago.
>
>Andy Austin

Thank you for explaining the mechanism of the mutation (and the possibly 
more
accurate estimate on when the sickle-cell mutation emerged).  This 
corroborates the
idea that so-called "races" is itself a non-scientific notion.