KnoTiles Knots Tessellations PuzzlesEducational and fun! Everyone is familiar with the utilitarian and decorative uses of knots, but mathematicians study knots as well. KnoTiles is a puzzle that serves as an introduction to the mathematics of knots and the symmetry of knot designs. All the knots through seven crossings can be formed with this set, and the instructions contain over a dozen brain teasers. The puzzle pieces feature photographic rope images with a second color of rope on

The special dot system is easy for any age to understand

7 I Want My Diploma 02:19

easy-to-follow instructions teach kids to follow precise visual diagrams

The Mazarin Stone

This set provides hours of fascinating fun for the future scientist

Kepler and Galileo

Makes a great science fair project

Set a goal of what the design should accomplish

Add a touch of the tropics to your patio this Summer with this palm leaf reversible rug

this card game features all U

from Rigoletto

the music sheets are held in place