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Brilliant is one way to keep your science and math whiz kids regularly engaged and challenged. Students receive challenge problems each week that they complete and then compare against their peers all over the world. They can see where they match up against others based on country and age, and share strategies with others students. The site also hosts competitions involving game theory, writing algorithms, and other fun shenanigans.

This is a really interesting page about how to teach science and math in a "flipped" way. Not just science and math but those are the examples given. Check it out.

"Our brains are wired to think logarithmically instead of linearly: Children, when asked what number is halfway between 1 and 9, intuitively think it's 3.  This attention to relative rather than absolute differences is an evolutionary adaptation."

interactive charts and downloadable datasets to work with real-world problems. can sign in using google account, and generate a code for your class to join you.

CK-12 Foundation provides a library of free online textbooks, videos, exercises, flashcards, and real world applications for over 5000 concepts from arithmetic to history