I have taught evolution and genetics at Williams College for about a decade. For most of that time, the only complaints I got from students were about grades. But that all changed after Donald Trump’s election as president. At that moment, political tensions were running high on our campus. And well-established scientific ideas that I’d been teaching for years suddenly met with stiff ideological resistance. ... In class, though, some students argued instead that it is impossible to measure IQ in the first place, that IQ tests were invented to ostracize minority groups, or that IQ is not heritable at...