Okay, here's the deal: when grown-ups burn stuff like coal or wood to make electricity, they end up with something called "bottom ash." Think of it like the yucky stuff left over after you finish eating your favorite food.
Bottom ash is made up of chunks of solid stuff that didn't burn up during the process of making electricity. This stuff is usually metal, glass, and something called "clinker," which is a fancy word for rocks that got super hot and melted a little bit.
Now, here's where it gets interesting (or at least as interesting as bottom ash can be). People don't just toss this stuff out. In fact, they can use it in a bunch of different ways!
One thing they might do is use the metal in the ash to make new things, like steel. They might also use the glass to make new bottles or other kinds of glass products.
But what about that clinker stuff? Well, it turns out that clinker can be used as a kind of road material. It's strong and sturdy, so it can help make roads that last a long time.
So there you have it, kiddo. Bottom ash might seem like yucky leftovers, but grown-ups can actually find some pretty cool uses for it!