"The audible "ahhhhh" is one of the greatest gifts a class can give to a teacher. FluidMath has facilitated the gift-giving practice for my Algebra classes. For example, my students see how the graph doesn't change as I manipulate the equation using the proper rules of algebra. When the rules are broken, they see the graph change. Fluid math allows the students to see an equation being manipulated without moving the graph (hopefully). They think that is cool and respond with an "ahhhhh"." Joe Cleary, Mathematics Teacher, Loomis Chaffee, Windsor, CT.