Write the numbers 1 through 8 in the circles so that no two numbers inside circles joined by a line differ by 1. Here is…
In the movie Die Hard, 4L of water must be weighed, and if incorrect, the fountain from which the water is drawn will explode, killing…
Polyominoes are shapes that are made by gluing identical squares along their edges. A domino is a shape made from two squares glued along an…
Circuit boards are made by imprinting a conducting metal like copper on a non-conducting material like fibreglass. If it were not for circuit boards, connections…