(electricity crackling)
CAROLINE: Watch this. Mary Elizabeth G. of Tallahassee, Alabama calls this cool Phenom "dancing raisins." All you need to make it is a tall, clear glass, some club soda, and a raisin cut in half.
RACHEL: Pour some club soda into a glass.
CAROLINE: Oh, wow, it's really fizzy.
RACHEL: I know, it's cool.
CAROLINE: Then, drop in a half a raisin.
RACHEL: Wait for about 20 to 30 seconds and watch what happens to the raisin. Oh, there it goes— look at that one.
CAROLINE: It went right up to the top and then came down.
RACHEL: Yeah, it goes up and down.
CAROLINE: It's dancing. Oh, wow. The reason why the raisin floats to the top is because the bubbles stick to the side of the raisin and make the raisin more buoyant.
"Buoyant" means that something floats more easily. The bubbles make the raisin float the way a lifejacket makes a person float.
RACHEL: We're going to see if we can get something heavier than half of a raisin to float.
CAROLINE: I think the weight might have something to do with it. I'm not sure, though.
RACHEL: We can start with the grapes.
CAROLINE: All right.
RACHEL: So, I'll take one... Here we go.
CAROLINE: I don't think it will work. Wow! Oh, my gosh, it works!
RACHEL: It's kind of like a buoy.
CAROLINE: That's so weird! It was buoyant.
RACHEL: It was awesome. It was so fast.
CAROLINE: I know, we just dropped it and it was, like, whoosh.
RACHEL: It's faster than the raisin going up.
CAROLINE: It's big and it doesn't have any creases.
RACHEL: Try this at home. Think of a question you'd like to answer, like: Can something heavier than a grape float, using bubbles? Will a walnut or a superball float? Make a prediction, then test it out.