While brushing his teeth, Sid wonders what happens to all the dirty water when it goes down the drain. At The Science Center, Sid and his friends explore how water travels in and out of our homes through pipes. And here's something Sid and his friends never realized: there's lots of water in the world, but you can't drink it all! We can only use fresh water, and there aren't a lot of fresh water sources in the world. That's why it's important not to waste water!