Inspired by the video "[url=https://www.youtube.com/watch?v=Mkn3PzdaByY]Cones are MESSED UP[/url]" by Numberphile: [br][br]Follow these steps to use the manipulative[br]0. Experiment with the value of n_2 by dragging the slider in the Algebra bar... what happens to the water in the left cone? [br]1. Set n_2 = 0.[br]2. Click to set S = true, then click animate on n_2 in the Algebra bar... [br]3. Set n_2 = 0.[br]4. Click to set T = true, then click animate on n_2 again...