- half-breed: this is primarily an allegory of the treatment of minorities (blacks or jews or both) in 1930s america. but, is this also an allegory of einstein's correction of maxwell's equations? of the einstein-bohr debates? of zionism on the brink of the second world war? even of thomas jefferson as benevolent slave owner? there's little bits of all of it. and, like many of these texts, i'm wishing there would be a deeper exploration of pretty much all of it. asimov is still young, here...