I reviewed this website for about 10 minutes and spent another 20 minutes reviewing a demo. This website is a project to connect mathematics instructors with effective teaching tools. The quality of the content was very informational and educating. A link on the Calculator Demo titled "what you dont see" describes interestingly the drawbacks graphing calculators possess when displaying certain graphs. This demo was very helpful in illustrating how exactly the TI-85 or 83 type calculators have their limitations. The website was very easy to use and to learn from.