Astronomy Picture of the Day
This site from NASA features a different daily image or photograph of the universe with a brief explanation written by a professional astronomer. A similar site is Image of the Day, from the National Oceanic & Atmospheric Administration.

Awesome Library
Consists of 37,000 "carefully reviewed resources, including the top 5 percent in education," organized by user type and topic. Includes the "Awesome Talking Library" as well as translations in 23 different languages.

Bartlett's Familiar Quotations
This page on Bartleby has more than 11,000 quotations from the 1919 tenth edition, searchable by subjects, titles, and authors.

Coolmath
Lessons and help with prealgebra, algebra, precalculus, and calculus. Also offers puzzles, games, a calculator, and a Math Survival Guide.

Federal Resources for Educational Excellence
One-stop shopping for free federal teaching and learning resources searchable by subject or medium (animations, primary documents, photographs, videos).

Great Websites for Kids
A large collection of links on many subjects of interest to kids, compiled by the Association for Library Service to Children, a division of the American Library Association.

Holocaust Home Page
Part of Shamash: The Jewish Network site. The page includes links to Holocaust photographs, Holocaust denial sources and documents to refute such claims, the Simon Wiesenthal Center, the United States Holocaust Memorial Museum, and more.

How Stuff Works
Contains an "explanation of how the world actually works" in categories such as "Adventure," "Animals," "Auto," and more.

Information Please Almanac
A quick reference destination for a variety of topics. Also offers such tools as a perpetual calendar.

Merriam-Webster Online
Definitions include the part of speech; pronunciation, including audio; and links to words used in the definition. Also here are a thesaurus, a Spanish-English dictionary, a medical dictionary, word games, and more.

NOVA
Provides teachers and students access to articles, audio slide shows, audio stories, expert Q&A, interactive segments, interviews, program videos, quizzes, time lines, and video shorts related to this TV series.

Our Library
Supported by Visionlearning, with funding from the National Science Foundation, this site provides high-quality science modules in biology, chemistry, earth science, physics, and more.

Snopes
The site for "urban legends, folklore, myths, rumors, and mis-information."

Virtual Frog Dissection Kit
Go virtual-save a frog! Users dissect Fluffy the frog and can also play the "Virtual Frog Builder Game." From the Berkeley Lab and available in several languages.

Word A Day
This can help build vocabulary via a daily e-mail or weekly visit to the site. Usually, there is a theme uniting the daily words each week.