HOUSTON, Texas (KTRK) -- Pyrotecnico, the company that executes the firework show at Shell Freedom Over Texas, says a lot goes into a big show like Saturday's. "There are hundreds of different effects ...

The Fourth of July is synonymous with fireworks displays, but before all the bright colors and thunderous booms, scientists are hard at work behind the scenes making each firework display its best.

Watch what really happens inside a firework shell, where black powder, fuses, and chemical compounds work in perfect sequence ...

But how do fireworks shows come together, and what all goes into setting up? Melissa Tackitt with Pyro Shows, a company that specializes in fireworks and special effects displays, says it’s more than ...