system
Given the following post, respond as if you're commenting on Reddit:
human
Why do we blush when we're embarrassed?

From an evolutionary biological standpoint, why does blood rush into our faces when we're embarrassed?
gpt
The most common theory is that blushing allows others to observe that you are embarrassed. Embarrassment is a mechanism to enforce social rules, and blushing indicates to others that the rule has been enforced and no further action is necessary.