HippoCampus.org is a free, core academic website that delivers multimedia content--videos, animations, and simulations--on general education subjects to middle-school and high-school teachers and students. Teachers can use these as classroom resources, while students can use the site as a study resource.
The Hooda Math website is a collection of K-12 math games, videos, timed math tests, and tutorials. The site is organized by resource type, grade level, and math subject. Subjects covered include addition, subtraction, multiplication, division, fractions, integers, and algebra. To fund the site, some pages have advertising.
HowStuffWorks provides easy-to-understand explanations of how the world works. Topics include everything from car engines to search engines and cell phones to stem cells. Each topic has a variety of comprehensive articles, helpful graphics, and usually an accompanying podcast and video. This information can be used as resource by middle and high school students or K-12 teachers; teachers of elementary school students may need to modify the materials to make them more grade-level appropriate.
HubbleSite contains information about all aspects of the Hubble telescope, such as missions, construction, and current news. The website has multimedia resources (e.g., numerous, searchable photographs taken by the telescope; videos about space; astronomy podcasts; and quizzes). The website content can be used by middle, high, and postsecondary school students for independent research and by K-12 teachers for classroom lessons. Teachers of elementary school students may need to modify the materials to make them more grade-level appropriate.