What is race, anyway?

Well, it ain't this:

The school, in Brent, northwest London, rejected the 12-year-old child because his mother converted to Judaism at a Progressive rather than Orthodox synagogue. M’s father is Jewish, but custom dictates that the faith line passes through the mother.

The judges said that “the requirement that if a pupil is to qualify for admission his mother must be Jewish, whether by descent or by conversion, is a test of ethnicity which contravenes the Race Relations Act”.

In. Sane.

In case you missed the implications of that, what England's distinguished legal scholars have decided is that it's possible to change your ethnicity by conversion.