Have you ever marveled at how fireworks, toy rockets or real spacecraft can launch into the air? It can be an amazing thing to witness. It is thrilling to see something lift off against Earth's gravity. The strong push required to launch a spacecraft comes from a chemical reaction in its rockets. This means that every time you see a spacecraft launch, you're watching chemistry at work. In this activity you'll get to blast an object into the air using two simple household ingredients: baking soda and vinegar. Investigate how to mix these chemicals to get the best lift off, and then this Independence Day you could give your family a homemade, gravity-defying show!