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 ...

J&M Displays employee Callie Williams works on wiring fireworks for the Freedom Festival fireworks on the Second Avenue bridge in Cedar Rapids on Thursday. (Savannah Blake/The Gazette) Buy Photo CEDAR ...

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.