The multiple charms of Pascal's triangle
Is it possible to visualize a four-dimensional figure?
Can the shuffling of cards (and other apparently random events) be reversed?
The problem of Mrs. Perkins' quilt, and answers to last month's puzzles
Puzzles that can be solved by reasoning based on elementary physical principles
Freud's friend Wilhelm Fliess and his theory of male and female life cycles
The persistence (and futility) of efforts to trisect the angle
"How to cook a puzzle, or mathematical one-uppery"
The eerie mathematical art of Maurits C.Escher
The hierarchy of infinities and the problems it spawns
Recreational numismatics, or a purse of coin puzzles
Dr. Matrix returns, now in the guise of a neo-Freudian psychonumeranalyst
Magic stars, graphs and polyhedrons, and answers to last month's problems
A selection of elementary word and number problems
Pentolninoes and polyominoes: five games and a sampling of problems
The superellipse: a curve that lies between the ellipse and the rectangle
Thoughts on the task of communication with intelligent organisms on other worlds
On the relation between mathematics and the ordered patterns of Op art
Some diversions and problems from Mr. O'Gara, the postman
The lattice of integers considered as an orchard or a billiard table