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Short videos that capture the math and science of real world jobs. Well done examples that are supported with small project based lessons. A subscription site that allows non-subscribers to view a limited number of videos.

A paid subscription site that offers interactive modules (gizmos) might not be worth subscribing to, but worth the look to see what can be done with technology.

Cool student interactive simulations for lower and upper level math. Lots of science applications too.

How to develop a circle equation in algebraic form when the circle touches the horizontal x-axis and learn how algebra is used in geometry to derive the equation of a circle in algebraic form in mathematics.