HBD is human biodiversity, which is considered by some on the left to be a euphemism for "black people aren't as clever as white people" and aligned with eugenics. In fact, it's the study of human genetic variation [0], which has many implications for fields such as healthcare.
As you can imagine, it's an extremely sensitive subject which is widely mischaracterized by people on both the left and the right for their own political ends.
As you can imagine, it's an extremely sensitive subject which is widely mischaracterized by people on both the left and the right for their own political ends.
[0]: https://en.wikipedia.org/wiki/Human_genetic_variation