See the visual proof of (a - b)2 +2ab using coloured tiles,
See the visual proof of (a+b)2 - 2ab using coloured tiles,
Writing is undoubtedly an integral part of the curriculum and so we compel our students to write all the time.
Don't throw away the plastic bottle. Instead, turn that into your pocket microscope!
Here is an Aha! moment in the history of science when Eratosthenes proved Earth is not flat.
It is 2016, the Olympic year.