This Web site from the National Institute on Drug Abuse focuses on the brain's response to drugs. Students navigate through a series of colorful and informative pages that describe certain regions of the brain and how the chemicals in drugs like marijuana, stimulants, hallucinogens, inhalants, opiates, and steroids can harm them. To aid teachers with the brain anatomy and function, a helpful teacher's guide accompanies the site, as well as more detailed information on the drug effects.