The Dragon of Ignorance has three heads and three tails. You can slay it with the Sword of Knowledge, by chopping off all its heads…

The LCD numbers on a stair climber or alarm clock or microwave are made up of straight sections arranged either horizontally and/or vertically. That is,…

Equipment: Pieces numbered 1 through 25 and a 5×5 board. Number of Players: 2 (a cobra player, and a snake charmer) Time: 10 minutes How…

Coyotes demarcate their territory by peeing on bushes, rocks, shrubs, cacti, trees, and anything else that is lying around. It is tiring, never-ending work. That…

Human cities, especially newer ones are usually organized with orthogonal (right-angled) streets and avenues. Here is an example from Gaza: Robot cities are similar to…

Write 1’s and 2’s in the circles so that no three consecutive numbers sum to a multiple of three. Extensions: There are four solutions to…

Draw an outline around any 2 by 2 square. Look at the numbers in the square. What patterns do you see?Use addition to find another…

In 1985 Nanotechnology guru, Richard Smalley, discovered the smallest soccer ball. It was made of 60 carbon atoms as shown on the right. On October…

Students begin by writing numbers on their own five by five grid like the one shown on the right. Numbers can be used more than…

A future development includes the creation of large housing complexes based on two inter-connecting modular units with the same side length: In cold climates, energy…