To battle the bulging waistline, the feds have devised 12 food pyramids to help choose a lifestyle that balances nutrition and excercise. Is this mound helpful?

Water shortages loom as world population and economy soar. American Southwest, Egypt, Iraq, China. People are getting thirsty pretty much around the world. How does this matter?

World population has reached 6 billion. What does this mean for the environment, resources, humanity? Six billion people on Earth — is that a good thing?