they can be great activities for kids. (And adults, of course!) These math puzzles test your brain and critical-thinking ...

This one could be a good logic puzzle for kids because it also involves some math. Four playing cards, one of each suit, lie ...

For older kids, this movie is a great introduction to the fascinating world of cryptography—how math and logic can be used to ...

Another fantastic puzzle of his I remember vividly involved an unusual shape. When I do recreational math with kids, the way I present it is the following: A cylinder looks round from one side but ...