From Desmos.com:
‘At Desmos, we imagine a world of universal math literacy, where no student thinks that math is too hard or too dull to pursue. We believe the key is learning by doing. When learning becomes a journey of exploration and discovery, anyone can understand – and enjoy! – math.
To achieve this vision, we’ve started by building the next generation of the graphing calculator. Using our powerful and blazingly-fast math engine, the calculator can instantly plot any equation, from lines and parabolas up through derivatives and Fourier series. Data tables open up a world of curve-fitting and modeling. Sliders make it a breeze to demonstrate function transformations. As browser-based html5 technology, the graphing calculator works on any computer or tablet without requiring any downloads. It’s intuitive, beautiful math. And best of all: it’s completely free.
Desmos is used by students, teachers, researchers, and general math enthusiasts from every state, and 169 countries.’
Eli Luberoff began his programming life on his TI-83 graphing calculator in elementary school, culminating with a working version of Monopoly which was destroyed when he removed the backup battery by accident. He began working on the software that would become Desmos.com during a year-long hiatus from Yale University in 2007, returning to graduate summa cum laude with degrees in Math and Physics in 2009. Eli was also selected by Bloomberg Businessweek as one of the top 25 entrepreneurs under 25 in 2011.
https://dl.dropboxusercontent.com/u/41715871/Eli%20Luberoff%2007-17-2015.mp3