I love to listen to Margaret Wertheim. She is interesting and makes things simple to understand. I have heard her speak 3 times now and I still enjoy it.
Here is a short speach she gave at TED. This is interesting because it helps to explain the HYPERBOLIC CROCHET CORAL REEF and the mathematicls behind it.
This is just over 16 minutes long. Let me know what you think about it.