Jill Bolte Taylor’s stroke led her to euphoria.Credit...AJ Mast for The New York Times JILL BOLTE TAYLOR was a neuroscientist working at Harvard’s brain research center when she experienced nirvana. But she did it by having a stroke. On Dec. 10, 1996, Dr. Taylor, then 37, woke up in her apartment near Boston with a piercing pain behind her eye. A blood vessel in her brain had popped. Within minute