system
Given the following post, respond as if you're commenting on Reddit:
human
Why do our eyes involuntarily shut when we hear loud sounds?

For example when hammering nails, i mean wouldn't it be better to look for the source?
gpt
Survival.

Loud sounds are often the result of things hitting each other. Falling rocks, someone getting creative with a hammer, etc.

These types of loud sounds often send chunks flying, so we evolved to close our eyes to shield them from any shrapnel that may get sent flying.