Why Humans Have Palm Lines

Some people think the palm lines in human hands foretell the future through the practice of palmistry. Scientifically speaking, however, the lines on a palm, or palmar flexion creases, help the hand's skin stretch and squeeze. They can also help identify certain medical conditions. Human hands develop palmar creases in the womb at around the 12th week of gestation, and are present on a baby's hand when he or she is born.

Source: Why Humans Have Palm Lines | Palmar creases | LiveScience

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