Rumble! Crash! Ka-boom! A hotel falls in a dusty heap. The hotel was 11 stories high. It takes 60 seconds to fall.

If you have ever baked homemade cookies, you know it takes careful planning to make something from scratch. Did you know you also need a careful plan for turning old things back into scratch?

Demolition (“demo”) is the controlled tearing-down of a building or other structure. It’s not as easy as it looks. It might be as fun as it looks, though!

Before demo starts, workers are busy. They remove glass. They disconnect water. Imagine toppling a building while windows and water fly everywhere! Cranes, wrecking balls, and bulldozers can smash small buildings. Large structures sometimes require implosion. Implosion means “to burst inward.” It is the opposite of explosion, where objects blast outward, like fireworks. Implosion experts plan carefully.

They study building maps. This helps them know what blasting material to use and where to put it. Next, workers drill holes in the walls. They fill the holes with explosives. Exploding cord connects each blast point. Someone lights the fuse. The blasts go off at different times. This makes the building collapse on itself. Falling walls push tumbling pieces toward the center. Done right, implosion takes down a building without harming anything nearby. The dust settles. Cleanup begins. Workers try to save what they can. Wood, pipes, and concrete are recycled. There’s still a big mess. Broom and dust pan, anyone?