Second I chose... http://www.health.gov/dietaryguidelines/. This is also an excellent website to look at what U.S. Department of Health and Human Services recommend for not only daily nutrition, but ways to stay healthy throughout our lifetime. It also has links to articles written by professionals from an array of topics.
Last but not least... www.kidsgeo.com/geology-for-kids/! I love this website because it is perfect for kids! It is easily marked so you can pick and choose what you want to learn about instead of having to search all around the website for what you want!