Primary purpose of this lecture is to preset on Trash and Recycling. Some items contain hazardous material. The following are common household articles that contain hazardous materials: Batteries; Florescent light bulbs; Cell Phones; Computers etc. Recycling is making a new product out of an old one (e.g. making paper out of old newspaper instead of virgin wood fiber). Reusing means simply extending the life of a product by reusing it (e.g. reusing car parts, or bringing a reusable cloth bag to the store).