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Lisa Kudrow
Lisa Kudrow, best known for her role as Phoebe on Friends, is actually a total brain! She graduated from Vassar College with a degree in biology, and worked for her father, a famous headache specialist, studying and conducting clinical research on headaches.

Six months after graduating college, however, Kudrow had a change of heart. She opted to pursue acting instead of continuing her education in grad school — and then Friends happened.