Atomic structure and radioactivity post 8

Today we learned about half-lives and i finally learned that in half lives nothing disappears the half life represents the part that is still radioactive, but nothing actually goes away like I originally thought. This is the picture of us in lab today. We cut up lots of pieces of paper and dumped them out. The ones landing on colored side were the ones that were radioactive. The white ones were the decayed ones. We continued this process multiple times.