What is pre-algebra? If you want to be a smart-aleck, I guess that any form of arithmetic before algebra could be considered "pre-algebra." But Khan Academ
Khan Academy Computing: New course: Learn SQL interactively on Khan Academ...
Example: two-step equation with numerator x | Linear equations | Algebra I | Khan Academ - YouTube
Back in June we told you that we’d be experimenting with a learning lab, and today marks the opening of the Khan Lab School, which will be composed of a small cohort of around 30 students. Khan Academ
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This is a video about Diego Velazquezes most famous artwork, Las Meninas. The people in this video look at and analyze why Velazquez painted different aspects of this painting. I think it tells you alot about velazquez as a painter and Las Meninas
Bruegel, Hunters in the Snow (Winter) | Antwerp, Bruges and Brussels | Northern Renaissance: 1500s | Renaissance & Reformation in Europe | Khan Academy
Statistics: Review of Mean, Variance and Standard Deviation
i as the principal root of -1 | What are the imaginary numbers? | Khan Academy | See also this: https://www.quora.com/Why-was-5-x-3-5+5+5-marked-as-wrong/answer/Richard-Muller-3/comment/14021732
French Revolution (Part 4) - The Rise of Napoleon Bonaparte | European History | Khan Academy