When I read this week's chapter of the DNA book about idea networking, I immediately thought of TEDtalks. Then, of course, they mentioned them directly. This is a cool animation (with no dialogue) of how ideas are connected and spreading through the Ted network.
The deadliest events in history, ranked by deaths per day--I have heard that the San Fransisco death toll was way understated to not freak out east coast banks. I would think given how the city looked afterward that it was higher.