Suicidal Photoaxis Arthropod

If the door is open for 2 seconds, a tiny fly will somehow find its way to whatever screen I'm using. Flies chasing the light get in the way. Wave 'em off and they seem to multiply.

What do they like about light? If I've ever thought to do any reading on the subject, time and memory have failed to recover the reason a fly has such an affinity for light. I'll do a quick search...

Well, it turns out photoaxis, which is the tendency of some insects to be attracted to light, is a topic that isn't universally agreed upon by science. Some postulate that bugs use the stars and Moon to navigate; others think it's to help bugs find flowers. Still, others believe bugs are suicidal.