Hollywood beauty Rosario Dawson gave up on a successful career as a marine biologist to become an actress. The Sin City star excelled in biology while at school - but was forced to give up the subject when her family couldn't afford to send her to college. She says, "I was very interested in biology, chemistry and maths. but coming from a working class family, I never felt that I could just stop working. "My family couldn't afford to pay for me to go to college."