Here's what you need to know about Phineas L. MacGuire, boy-scientist extraordinaire, aka Mac: 1. He's allergic to purple, telephone calls, and girls, and can prove it. 2. He's probably the world's expert on mold, including which has the highest stink potential. 3. He does not have a best friend. He does, however, have an un-best friend, who he does not -- repeat, not -- want to upgrade to best friend status. But disaster strikes when his teacher...