Tomorrow is Independence Day in the United States. Cities and towns all over the country will feature fireworks displays to celebrate the day. I'm sure that many of you will be enjoying a fireworks display tomorrow. (My kids are too young and my dogs too are too skittish to enjoy fireworks). If after watching a fireworks display, you or your children wonder how the fireworks actually work, take a look at the following videos from NPR's SkunkBear, National Geographic, and Reactions.