a site about knots: how to tie them, how to appreciate their beauty. Even the seriously knot-challenged among us can learn to tie many useful and popular knots by following along with the short, step-by-step instructional video clips
every game starts out as the handmade creation of the inventor, which eventually becomes a standardized and mass produced product; but sometimes the commercial versions of games are not available, too expensive, or just not nice enough
by Bill Green. using the Sobel and the Laplace methods."Edges characterize boundaries and are therefore a problem of fundamental importance in image processing"