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What's Special About This Number? - a property for every number from 0 to 10.000
saved at 14.03.2011, by seventhwave, 10 UsersKhan Academy
saved at 14.03.2011, by tematapuna, 10 UsersMath, Physics, and Engineering Applets
saved at 04.01.2011, by geekcowboy, 3 UsersConcrete examples don't help students learn math, study finds
saved at 25.04.2008, by stevecopley, 1 User