Today's Oprah was about the science behind sex appeal. Researchers have developed an equation—involving facial symmetry and the "golden ratio"—that calculates attractiveness. Angelina Jolie and Halle Berry were ranked on a scale of 1-10.

Jolie and Berry both ranked in the middle 7s, and while no face has yet to rank as a 10, Brad Pitt managed to score a 9.3.