July 4 is right around the corner. National Geographic's photographers share their tips on how to take the best photos of fireworks for the upcoming holiday. Read on for advice like: "The long exposures required for firework photography mean slow shutter speeds. Keep your camera motionless by using a sturdy tripod and a shutter release cord. When shooting a scene that includes not just the sky but also other elements like a cityscape, keeping the horizon line straight is particularly important."