BBC News - Index finger length prostate cancer clue
I checked the date before posting this, as I thought it might be an April Fool.
But it seems there is some degree of logic about it. If your index finger on your right hand is longer than your ring finger, you are one-third less likely to get prostate cancer later in life. All down to indicators of the levels of testosterone you were exposed to in the womb.
I've just checked. Yippeeeee!