Palm reading really could predict your future: Men whose index fingers are longer than their ring fingers are 33 percent less likely to develop prostate cancer than guys who have short pointer fingers, according to a study in the British Journal of Cancer.

“Relative finger length could be used as a simple test for prostate cancer risk, particularly in men aged under 60,” study author Ros Eeles from the Institute of Cancer Research told Reuters.

Could it really be that simple?

As it turns out, people who have longer index fingers were exposed to less testosterone when they were a baby in their mother’s womb, say the scientists. This may help protect against prostate cancer later on. It also may make you a worse athlete. According to a study from Teeside University, people with longer ring fingers are more successful with sports; again, this can be attributed to having more of this masculine hormone.

By this time, we’ve assumed you looked down at your hand. If the prognosis isn’t good, don’t worry just yet—prenatal testosterone is only one of many prostate cancer risk factors.