People choose friends by smell.

A team of scientists from the Weizmann Institute of Science in Israel studied how smells affect friendships. It turned out that people are more willing to build friendships with those who smell the same as them. It was possible to prove this with the help of an experiment. First, the researchers analyzed the smells of the volunteers. They chose pairs of close friends of the same sex, whose friendship, they said, developed very quickly. The scientists also took odor samples from the control group, which included people who did not know each other. The analysis showed that there is a lot in common between the smells of friends.