system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why don't flies die when they hit windows?

You know when you have a fly in the room and they fly to the window to try and escape. How does the force of them smacking into the glass not shatter their bodies. Especially considering how easy they are to squish with a newspaper.
gpt
The same reason that an insect can fall x40 times the height of it's overall body, but you can break bones by falling x4. 

Weight. 

A fly is quick but it's also very light, therefore the overall force of impact is substantially lower.