Dancing Raisins

What you need

• A clear glass
• Clear soda or sparkling water
• A handful of raisins

Why it works

Sparkling water is full of tiny carbon dioxide bubbles. The wrinkly surface of a raisin is perfect for those bubbles to grab onto and cling together. Enough bubbles make the raisin float all the way up — then at the top, the bubbles pop and the raisin sinks back down, over and over, so it looks like it's dancing.