Tamara found mathigon--textbook-of-the-future:

• Moderately builds student knowledge“Better understanding through applying in creative tasks”
• Slightly improves teaching efficiency and productivity“Can’t remember”
• Slightly provides school data
• Significantly teach-problem-solvings
• Slightly improves creativity and critical thinking
• Significantly improves creativity and critical thinking
• Moderately improves parent engagement“Award system for solving ”