We recently spent a few very nice days at the sea. I knew there would be a beach with very neat sand, and so I prepared some toys for the kids. Before I go into details, I should mention that a short while ago I bought a 3D printer kit (which, by the way, works […] Read more

A machine made from paper which multiplies any two numbers between 1 and 10, using marbles. The path of the marbles throught the machine is a little Rube Goldberg-esque but great fun to watch, and the machine is very helpful in conveying the concept of multiplication to young students. Read more