Why Do Gnats Fly In Circles And Never Hit Each Other?
Mosquitoes (and I am assuming they are the same animals as gnats) have random flight paths - hence the spirals. A change in direction is dictated by sensory hairs on their antennae. They are particularly partial to big blonde fidgety beer-drinking women with smelly feet wearing dark clothes and lots of perfume (since they fly towards movement, warmth, increased levels of carbon dioxide, lactic acid, humidity and certain chemicals) and less partial, I suspect, to each other. This is probably why they never hit each other.