system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is glass called a liquid?

I know about surface tension and viscosity are things, but how and what kinds of glass are liquids?
gpt
It's wrong, a common fallacy. People noticed that old windows were thicker at the bottom, and wavy, and assumed they were slowly flowing downward. This is incorrect; builders of old windows just made them this way.