NASA Resources for Students.

NOVA from PBS is an excellent source for science, technology, and nature.

Tinkercad is a free web app for 3D design, electronics, and coding. 

Having trouble understanding a math problem? Try betterexplained.com or watch a techmath video.

Duolingo will help you learn a language.

The CIA World Factbook provides basic intelligence on the history, people, government, economy, energy, geography, environment, communications, transportation, military, terrorism, and transnational issues for 266 world entities.

Learn about the text, history, and meaning of the U.S. Constitution from leading scholars of diverse legal and philosophical perspectives with Interactive Constitution

Need to find Primary Sources? The Digital Public Library of America pulls from digital archives all over the country. Voices of Democracy focuses on the great speeches and debates of US History. The National Archives not only contains America’s Founding Documents but also features a section called Founders Online, which contains searchable documents from the 7 major shapers of the United States.

DOAJ (Directory of Open Access Journals) contains scholarly research covering all areas of science, technology, medicine, social sciences, arts, and humanities.

Need a reliable news source? Choose Non-profit or publicly owned news organizations instead of a private company. In the United States, National Public Radio and the Public Broadcasting Station both have a news branch and are publicly funded. 

You can also try an independent Newswire, which is a wire service that electronically provides up-to-date information to the media about breaking news, issues, and events. An independent newswire is not paid to select articles, like a commercial or PR newswire. The Associated Press is a non-profit and based in the US. Reuters is publicly owned and based in the UK.

Watch a college lecture for free at Open Yale Courses and MIT Open Coursework.