Adding better, newer Notebook

Happy to put in some images with it too if you'd like them:

![curve](https://f.cloud.github.com/assets/5034604/2298291/cd9a0d54-a0ba-11e3-806a-ad7bb9b13796.png)

![latex](https://f.cloud.github.com/assets/5034604/2298292/d154f9cc-a0ba-11e3-9b4b-cfe83bda00a7.png)