system
Given the following post, respond as if you're commenting on Reddit:
human
Why does it look like there is water on the road when it's really bright?
gpt
It's a mirage. It's not because it's bright, it's because it's hot (but bright and hot do tend to occur together).

As the ground heats up, it starts to heat up the air close to the ground.

As light travels through different bits of air which have different temperatures, it changes speed, and this causes it to bend. The bending light results in light from the sky reaching your eyes from a direction which makes it appear to have come from the ground.

When your brain sees this, it assumes that the image of the sky it's seeing has to have been reflected in a pool of water. So it appears to you that there's water when there isn't.