It is the 4th of July once again and the fireworks will be out in force tonight. How do those things work? Let the let the chemistry experts explain! Trust us, this is far safer than having your uncle Fred try to show you after he says "hold my beer." Today fireworks displays are seen on most holidays. Have you ever wondered how they work? There are different types of fireworks. Firecrackers, sparklers, and aerial shells are all examples of fireworks. Though they share some common characteristics, each type works a little differently.