The finding that one in five women are sexually assaulted in college is as widely known as it is startling. Countless media reports repeat and recycle the alarming statistic, and it headlined the initial report introduced by Vice President Biden from the White House Task Force to Protect Students from Campus Assault. But how trustworthy is that figure of one in five? An earlier poll found it was more like 1 in 40, but should it matter whether the real number is closer to the high or low end of the scale?