system
Given the following post, respond as if you're commenting on Reddit:
human
Explain like I'm five: Cold Fusion

What is cold fusion? How does it work and how would it be used practically?
gpt
Imagine you have two balls. These balls really don't want to touch each other but if you put a lot of energy into forcing them to, they explode releasing tons of energy. 

This is called nuclear fusion.  The balls are certain atoms and the energy is usually extremely high temperatures(millions of degrees). Instead of making the two atoms touch you are combining them into one larger atom. This process is what the sun is doing to create all of its energy.

Cold fusion is the term for a Nuclear Fusion reaction that can be done at a relatively cooler temperature and other conditions that we can create on earth. Currently there is no cold fusion technique that produces more energy than what is required to sustain the reaction.