ELi5 Why can flys see you coming a mile off when you try to swat them…but they can never seem to find their way back out of an open door?

Question

ELi5 Why can flys see you coming a mile off when you try to swat them…but they can never seem to find their way back out of an open door?

In: 415

Answer 1

It works for me 9/10 times, but here it is

Flies and all insects follow light, turn off all lights and they’ll follow light Comin from door.