Bats produce pulses of sound at extremely high frequencies through their mouths. These pulses are separated by short periods of silence during which the bats listen for these sounds to bounce off objects and return. Bats have highly developed ears, which pinpoint objects and prey by detecting these echoes, even if these echoes are .1% as strong as the original sounds.

The human pheromones that work at attracting women are airborne particles that move through the air. They are released from the body through natural evaporation and a woman can detect them if she comes into direct contact with them. There are other types of pheromones that cannot become airborne. These are detected through touch. It’s one of the reasons why we like kissing so much.