Unreasonable persistence of mothers' influence on their sons

Did you know that, for men, the ratio of the length of the second digit (aka the index finger) to that of the fourth (the ring finger) is correlated inversely with level of testosterone they were exposed to in the womb? I didn't either.

Now, get this: "the dancing men with the lower 2D:4D ratio [i.e., those with a greater testosterone exposure] were rated by the women as significantly more attractive, dominant and masculine."