Bradley Fields does more than a magic act–a lot more, mixing jokes, mime and math into his fast-paced array of tricks and illusions. After settling down a few years back to raise his own children, the world-renowned illusionist hit upon the idea of using magic to teach math. He appears on stage at Durham’s Carolina Theater at 7 p.m. on Friday, Jan. 7. Tickets are $16-18 for adults, $8-10 for kids.