I learnt a rather curious fact by watching, of all things, an episode of the TV comedy show MASH.
The episode, The Red/White Blues, first screened in 1981. The plot is that the malaria season is about to descend on the MASH unit (during the Korean War, sometime between 1950 and 1953).
There are no stocks available of the usual anti-malaria drug, so the unit is sent a case of primaquine, a malaria suppressant. Colonel Potter isn't happy, and asks "What about the negroes?"
It turns out that those of black African descent can't be given primaquine, as it was known to give them hemolytic anemia. Everyone else is given the medicine, but Corporal Klinger (of Lebanese ancestry) and several others become sick. He is thought to be malingering, but is later diagnosed to be suffering from hemolytic anemia. We're told at the end of the episode that by the late 1950s it was also recognised that people of Mediterranean descent were unable to tolerate primaquine.
Why is this significant? As I mentioned in my last post on whiteness studies, modern liberals often deny the real, biological existence of race. Instead they prefer to view race as a social construct.
One of the arguments often made against the 'social construct' view of race is that modern medical science is finding that there are drugs which work effectively with some races but not others. Therefore, the real, biological existence of race is being accepted (and put to scientific use) by medical researchers at the very time it is denied by certain liberal academics.
What the MASH episode reveals is that knowledge of the biological differences between the races has been known to medical researchers since at least the early 1950s. It's not new knowledge after all. The reality of such differences was accepted in an uncomplicated way by the liberal scriptwriters of MASH as late as the early 1980s.
Race denial is an expression of how latter-day liberals would like things to be; it tells us something about ideological preferences rather than the larger developments within medical science.