How free are students and teachers to express unpopular ideas in public schools and universities? Not free enough, Joan DelFattore suggests. Wading without hesitation into some of the most contentious issues of our times, she investigates battles over a wide range of topics that have fractured school and university communities--homosexuality-themed children's books, research on race-based intelligence, the teaching of evolution, the regulation of hate speech, and more--and with her usual evenhanded approach offers insights supported by theory and by practical expertise.

Two key...