system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does reflected light look like it's shimmering from far away?
gpt
Short answer: Air. 

Long answer: 
Light passes through several layers of air. When the layers are at different temperatures, it bends and twists light passing through it. On hot days close to the ground, it twists and bends enough to make far away objects shimmer.