If you like television celebrities, nonfiction authors, mathematics, illegal drug consumption, or any combination of the above: tonight is your night! Tommy Chong – of Cheech & Chong and That 70s Show Photo Hut fame – appears at the big ol’ Borders on N. Clark Street tonight at 7:30. He’s signing copies of Cheech and Chong: The Unauthorized Biography, so expect to be regaled with at least one gut-busting tale of elicit psychedelic adventure. But......