For many decades, scientists have noticed an extraordinary link between the length of your ring and index fingers and a plethora of apparently unrelated traits.
Evidence is growing that this 'digit ratio' effect is real. Recently, strong evidence has emerged that men whose index fingers are longer than their ring fingers are significantly less likely to develop prostate cancer.
To work out the ratio of your fingers, measure the distance from the midpoint of the lowest crease at the base of the finger to the very tip -- the fingernail does not count.
A long index finger correlates strongly with a lower risk of early heart disease and, in women, a higher risk of breast cancer and greater fertility. People with relatively long index fingers are also more likely to suffer from schizophrenia, allergies, eczema and hay fever.
The Daily Mail reports:
"... [A] short index finger relative to the ring finger ... correlates with higher male fertility and sperm counts, higher levels of aggression and increased aptitude for both sport and music ... [D]igit ratio ... [correlates to] more than 100 psychological traits and propensities to various illnesses."