system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do we know that conservation of energy is a law? How have we proved that energy cannot be created or destroyed?
gpt
A scientific law is simply a statement that holds up under repeated experimentation.

The law of conservation of energy has held up with every experiment ever thrown at it across all parts of the universe we can observe. It is verifiable with math, measurements, and tests. Is it *possible* that it's wrong (or incomplete)? Sure, but just try to prove it.