Free online repository of books, covering a wide range of subjects including science, history, encyclopedia and world fact books.
Khan Academy offers free practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps.
Citation machine helps students and professional researchers to properly credit the information that they use.
THE LEADING SOURCE FOR PROS & CONS OF CONTROVERSIAL ISSUES