From the article: the scientists looked at the ratio between ring and index finger, which is correlated with one’s level of testosterone. I wasn't aware of th

From the article: the scientists looked at the ratio between ring and index finger, which is correlated with one’s level of testosterone. I wasn't aware of this. Wikipedia entry here: https://en.wikipedia.org/wiki/Digit_ratio https://en.wikipedia.org/wiki/Digit_ratio That a greater proportion of men have shorter index fingers than ring fingers than do women was noted in the scientific literature several times through the late 1800s,[16][17] with the statistically significant sex difference in a sample of 201 men and 109 women established by 1930,[18] after which time the sex difference appears to have been largely forgotten or ignored.