http://en.wikipedia.org/wiki/Main_Page
- Please read only the English pages, not the Spanish ones.
http://www.efunda.com/home.cfm
- eFunda stands for engineering Fundamentals. Here you can quickly find concise, reliable and useful information, e.g. Formulas.
http://ocw.mit.edu/index.htm
- This is MIT's OpenCourseWare website. It is a free online publication of nearly all of the course materials used at Massachusetts Institute of Technology.
http://www.greatachievements.org/
- This website has simplified writing. It may be useful as a reference.
Some Scientific Journals, News Articles and Reports:
- "Nature" is a prestigious British scientific journal. Short versions of articles are free here.
http://www.sciencemag.org/
- "Science" is one of the world's top scientific journals. It's the American version of the British "Nature."
http://www.sciencedaily.com/
- This is one of the most popular science news websites today. In the "Reference" column you will find useful information.
http://www.scientificamerican.com/
- Magazine intended for the educated general public. It has some free articles.
http://spectrum.ieee.org/
- Engineering magazine with general topics
http://www.nap.edu/
- National Academies of Science and Engineering. Here you may find Safety Incident Reports, e.g. the Challenger accident report. You can find free downloadable PDF Files. The listed prices are for printed copies.
http://www.nist.gov/index.html
- The National Institute of Standards and Technology (NIST). You can find reports here.
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