Does radioactivity involve playing with your radio? Not exactly! In this BrainPOP movie, Tim and Moby discuss what it means when something is radioactive. Find out why some atoms are unstable and how they can turn into completely different atoms with different properties. You’ll discover the way in which some radioactive elements can change or decay, and find out how many billion years that change can take. Plus, you’ll see what kinds of dangerous rays or particles radioactive decay can create. In addition, you will learn about how radioactivity can be both helpful and harmful to humans!

Watch the Science movie about Radioactivity »

What is a half-life?

What is a radioactive isotope?

How do we know the age of the earth?