Smart people can have really bad ideas – like selectively breeding human beings to improve the species. Put into practice, Galton's concept proved discriminatory, damaging, even deadly.
An operation taking place in 1941 on South Side of Chicago.
Library of Congress
After Google suggested PigeonRank was at the root of its search function, a group of researchers put a small flock of the birds to a different classification test in real life.
Despite science refuting the existence of different human races, people have used "race" throughout history to divide and denigrate certain people while promoting their claims of superiority.
The study of human intelligence dates back well over 100 years. And the core disagreement between researchers and theorists is whether differences are genetic or largely influenced by the environment.