New York — before the City | Eric Sanderson 400 years after Hudson found New York harbor, Eric Sanderson shares how he made a 3D map of Mannahatta’s fascinating pre-city ecology of hills, rivers, wildlife — accurate down to the block — when Times Square was a wetland and you couldn’t get delivery.

TEDTalks is a daily video podcast of the best talks and performances from the TED Conference, where the world’s leading thinkers and doers give the talk of their lives in 18 minutes. Featured speakers have included Al Gore on climate change, Philippe Starck on design, Jill Bolte Taylor on observing her own stroke, Nicholas Negroponte on One Laptop per Child, Jane Goodall on chimpanzees, Bill Gates on malaria and mosquitoes, Pattie Maes on the “Sixth Sense” wearable tech, and “Lost” producer JJ Abrams on the allure of mystery. TED stands for Technology, Entertainment, Design, and TEDTalks cover these topics as well as science, business, development and the arts. Closed captions and translated subtitles in a variety of languages are now available on, at Watch a highlight reel of the Top 10 TEDTalks at