system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What are flys doing when just darting around the middle of the room?
gpt
They are looking for food/water/someone to reproduce with.  There is nothing more to it.  They are not smart enough to know that they are flying around the middle of the room, they are just flying around mostly aimlessly until they stumble upon (usually by smell via their antennae) something delicious or sexy.