ELI5: Explain Like I'm 5

Digit ratio

Hello kiddo! Do you know what finger length is? Look at your hand now, do you notice that some fingers are longer or shorter than others? The length of your fingers can tell us something interesting about your body!

Researchers found that the length of your fingers could provide clues about the levels of hormones in your body before you were born. These hormones are called testosterone and estrogen, and they play a significant role in how your body develops.

Now, let’s look at your hand - the digit ratio is the length of your index finger compared to your ring finger. Suppose your index finger is shorter than your ring finger. In that case, your digit ratio is low, and if your index finger is longer compared to your ring finger, your digit ratio is high.

Some studies have shown that people with a low digit ratio, meaning their index finger is shorter than their ring finger, have higher levels of testosterone, while people with a high digit ratio, meaning their index finger is longer than their ring finger, have lower levels of testosterone.

Scientists have also shown that digit ratio may provide an insight into the likelihood of certain traits, such as aggression, fertility, musical ability and personality characteristics like confidence, empathy and risk-taking.

So, next time you look at your hands, remember that your finger length is much more important than just how they look- they could be giving us clues about your body and personality!