For Real Clip: Bianca Gets in Gear
This is the 7th appearance of Slider.
Math Topic: Gears
The Big Idea: Watch carefully how two gears mesh and you can discover how their size and number of teeth affects the speed at which each turns.
NCTM Links: Algebra
This title is an allusion of the famous book, The Wrinkle in Time, by Madeleine L'engle.