What are fireworks made of, why are they bright and loud, and how do people make them? And, why do Americans celebrate the 4th of July with fireworks? We learn about pyrotechnics with licensed fireworks professional John Steinberg. And David Chavez, an explosives expert at Los Alamos National Laboratory tells us how changes to the materials used in fireworks can make them better for the environment and unleash new, more vibrant colors in the night sky. We also address firework safety and how to impress your friends by knowing what kinds of metals are in the fireworks you’re watching or the sparklers you’re playing with. NOTE: We know not all kids (or adults) enjoy the noise of fireworks. We do play the sound of fireworks at the very beginning and very end of the episode. And John Steinberg offers some advice to people who dislike fireworks in the middle of the episode.