Dr. Wilder claims to be the first person to recognize that the 'center of disturbance', center of a ridge pattern, is always where a volar pad exists. Wilder is also noted for the idea that ridges are ridge units fused together, a hypothesis which still remains unproven.
Tic-tac-toe is a game that is traditionally played by being drawn on paper, and it can be played on a computer or on a variety of media. History of Tic Tac Toe An early variation of the game was played in the Roman Empire, around the 1st century B.C.
Online games and resources for shapes, quadrilaterals, triangles, and polygons. This is an annotated and hand-picked list of games and other online resources related to shapes, quadrilaterals, triangles, and polygons, suitable for grades 1-5. Shapes / Polygons. Tic tac toe with shapes; drag the counter to the shape that has that amount of sides.