The journal Biology Letters published a study in which 1,453 women and 213 men were asked to rate faces with what researchers amusingly called "four standard levels of beardedness." The results actually vindicated both bearded and clean-shaven men.
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Few celebrities can contend with Thursday's 50-year-old birthday boy Charlie Sheen when it comes to spectacular public meltdowns. Take a look at Sheen other stars who have fallen from grace.