A remix of dapontes' project. --------------------------------- An isochrone is a line on a map/diagram connecting points from which it takes the same time to travel to a certain (different) point. In other words, a set of points with the property that a given process will take the same time to complete starting from any point in the isochrone. A curved that is formed by a set of points with this property is called an isochronous curve. A mathematician named Christiaan Huygens solved the isochrone problem without calculus, but instead used only Euclidean Geometry! He said: "When a cycloid is put downward, the time when the particle goes and slides and meets the bottom does not depend on the initial position of P from the position P in place of the uniform gravity. But it ignores friction" ------------------------------------------------- Please do not consider this as a remix because I redid the scripting for one of the cars in my own manner and with my own scripts. I even added a lot of features. This is a learning process for me. Thank you, dapontes. Also, extra information can be found on the following link given kindly by mathjp: http://www.mathcurve.com/courbes2d/synchrone/synchrone.shtml