Naturewww.nature.com
Nature - International Journal of Science
Peer reviewed research across physics, biology, medicine and earth science, plus news analysis written for a general scientific audience.
Science
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- Khan Academywww.khanacademy.org
Khan Academy - Free Online Courses and Practice
Video lessons and exercises from arithmetic through calculus, plus science, economics and test preparation, free to use.
Education
- Courserawww.coursera.org
Coursera - Online Courses from Universities
Structured courses and certificates taught by university faculty and industry teams, with deadlines and graded work.
Education
