Check out cool science demos as Head Rush Host Kari Byron makes a magnet-powered boat, and discovers how mood rings work. Plus, see how hydrofoils hover, how big Planet Jupiter is, and find out what gives natural silk its awesome sheen.

Kari Byron uses cool chemistry to make monster toothpaste. Discover tricks to revealing fingerprints and find out what plant uses smell to repel bees. How does an octopus mate with its arms? What happens to a soda bottle when you hit the top the top?