Are Humans Reaching Our Brain Capacity?; Drug Recovery Centers : Here & Now Remember learning humans use 10% of our brains? That's 100% false! Our brains are always active and actually have limits. Author Annie Murphy Paul and neuroscientist Peter Reiner join us. And, Massachusetts drug recovery centers are giving drug users a second chance to rebuild their lives. WBUR's Martha Bebinger has the story of one longtime drug user.