A psychology researcher writes: I want to bring your attention to a new PNAS paper [Persistent metabolic youth in the aging female brain, by Manu Goyal, Tyler Blazey, Yi Su, Lars Couture, Tony Durbin, Randall Bateman, Tammie Benzinger, John Morris, Marcus Raichle, and Andrei Vlassenko] that’s all over the news. Can one do a regression …