Thomas Sowell — who will have just turned 90 when this review is published — could have retired by now. He could be publishing the memoirs of a celebrated intellectual or the late-career tracts of an éminence grise. What does he give us, instead? A methodologically rigorous, closely argued, data-driven case for charter schools, with very little high-flown rhetoric (I noted one exclamation point) and 94 pages of data tables. Charter Schools and Their Enemies is a bloodbath for Sowell’s intellectual opponents, and it ought to be a neutron bomb in the middle of the school-reform debate. But Thomas Sowell has been giving the reading public and the policymaking class some of the most intelligent advice to be had for many decades — why would they start listening to him now?