The Killing Floor (a novel of The Infection)

An unexpected pop of purple creates a playful presence on this leather watch from Skagen Denmark.

Link representations - Manipulate the properties of one and observe instant updates to others without switching screens

Includes an easy-glide Touchpad that works more like a computer with a mouse

Explore individual representations, one at a time, or as many as four on the same screen

See multiple representations of a single problem - algebraic, graphical, geometric, numeric and written

Grab a graphed function and move it to see t ...