''Science'' and ''best-seller'' aren't words that usually go together. But neuroanatomist Dr. Jill Bolte Taylor has been sitting near the top of nonfiction best-seller lists for months with My Stroke of Insight, a memoir that chronicles the nitty-gritty of a massive stroke she suffered when she was only 37 years old (the book now occupies the No. 11 spot on Publishers Weekly's hardcover nonfiction list). It took the Harvard-trained Taylor eight long years to relearn how to walk, talk, read, and, finally, write. Louise Braverman a spokeswoman at Viking, Stroke's publisher credits the book's success to several things, including a speech Taylor delivered that has enjoyed a healthy life on YouTube. ''[She] provides hope because she's so articulate after having experienced what she did,'' Braverman says. ''People just like someone who has a happy ending.'' Oh, and it doesn't hurt that a certain someone was on her side: Taylor was the first guest on Oprah's Soul Series webcast and appeared on the talk maven's show Oct. 21. ''Oprah'' and ''best-seller''? Now, that makes more sense.