system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why do we only see fog when it is at a distance?
gpt
Fog is a collection of tiny water droplets suspended in air at or just above ground-level. They are too small to see individually but they bend light never the less. As you get further away, there are so many droplets bending light that the objects further away from you can't be seen because the light from those objects isn't (entirely) traveling to your eyes.