The ratio of the second to the fourth digit (2D:4D ratio) is a sexually dimorphic trait established in utero that differs between ethnic groups. It is associated with prenatal androgen exposure, and ...

The ring finger refers to the fourth digit of each hand, located between the middle and pinky fingers. In Western cultures, it is common for people to wear engagement and wedding rings on the fourth ...

Examine your fingers. Which is longer? Is it the index finger (the finger you use to point with – technically the second digit, or 2D, counting the thumb), or the ring finger (the fourth digit, or 4D) ...