[drhurdle]

This reminded me of a video I had seen a while back by ViHart about spirals and nature.

https://www.youtube.com/watch?v=ahXIMUkSXX0

Although her target audience is probably a bit younger than the people here, I still thought someone may find it interesting, especially if they hadn't thought about it much.

Edit: Also, if you have kids interested in math and these kinds of things, they may be interested in some of the other videos on her channel. She has a interesting way of presenting ideas on a few topics.