This clip provides a brief history of Helium and its discovery by humans. It mentions the some of the properties of the element and describes its different applications in many industries. It also explains that Helium is a nonrenewable resource.
Sheldon is invited to explain magnetic monopoles to the listeners of the NPR radio channel, and Barry Kripke takes this opportunity to pull a prank on him. Sheldon explains that ordinary magnets have two poles: a north and south. He mentions that cutting a magnet in half would not create a monopole; rather, it would create two smaller magnets, each with its own pole.