3D Puzzles There are a lot of cool, 3D block puzzles. Kind of like jigsaw puzzles, but because they are 3D and not 2D it’s always pretty complicated how to put them together. When they are put together, they seem to be very simple. Until you take them apart, and they become […]

## Invisible People In Your Brain

Square Roots Are Easy If you needed to find the square root of four, this would be pretty easy. The square root of four is either two or negative two. Negative two times negative two is four. Two times two is four. This is something we learn in elementary school, or […]