Imagine you have a packet of pop rocks (those that go tktktktktt in your mouth) and you pour it on your tongue.
Now some of those pops, and collide with others, causing them to pop too.
Those pops are pure energy, and we can harvest that.
When they’re all popped, there’s no energy left, thus, they can’t crackle any more.
Best way I could ELY5
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