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Four rods are hinged at their ends to form a convex quadrilateral. Investigate the different shapes that the quadrilateral can take. Be patient this problem may be slow to load.

Get started with calculus by exploring the connections between the sign of a curve and the sign of its gradient.

Polygons drawn on square dotty paper have dots on their perimeter (p) and often internal (i) ones as well. Find a relationship between p, i and the area of the polygons.

A napkin is folded so that a corner coincides with the midpoint of an opposite edge. Investigate the three triangles formed.

See how the motion of the simple pendulum is not-so-simple after all.

How is the length of time between the birth of an animal and the birth of its great great ... great grandparent distributed?

How many different symmetrical shapes can you make by shading triangles or squares?

In how many ways can you fit all three pieces together to make shapes with line symmetry?