Homer stops by Apu's convenience store to buy "the usual" and learns that he can sell grease. He tries to start a business around selling grease but realizes that his approach ends up losing him money.
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.
Fracking is known to be a leading cause of the lack of water in the world. Government and other environmental organizations focus on fracking in order to try and save our water resources. However, animal agriculture uses an exponential amount more than fracking.