Sperm are the cheetahs of the microscopic world: Made of little more than molecular muscle and batteries, tipped with a payload of genetic information, they are optimized for speed. But to orient themselves before their epic, seven-inch sprint (it’s more impressive if you’re less than one three-thousandth that size), they first need to sniff out the location of the egg—and, it turns out, the analogy to the sense of smell may be particularly apt.
These Feminine Smells Get Sperm Moving
