We live with thousands of chemicals every day--pesticides, degreasers, weed killers, fertilizers, bug killers, solvents, cleaners, medicine, chemicals of all kinds. Each and every chemical has a purpose. If we use them correctly, they do the job we want them to do. If we misuse them, many chemicals can be harmful. They may make you sick or even cause death. We do not have to stop using chemicals to protect ourselves; we just have to use them safely.