Symphony of Science: "The Unbroken Thread" (Attenborough, Goodall, Sagan)
Get ready for another awesome Symphony of Science video! Yes, that's right, more auto-tuned scientists with cool music and video. (See previous videos: A Glorious Dawn, Our Place in the Cosmos, and We Are All Connected.)
In this installment, it's primarily David Attenborough and Carl Sagan, though about two-thirds of the way in, Jane Goodall makes a splendid appearance. Goodall is an awesome speaker -- if you ever have a chance to see her in person, please do so. I saw her at the United Nations in the early 90's, and she was awesome.
Check out the YouTube page for HD options. Keep in mind that some of the video is sourced from YouTube itself, so it's not always super-pristine. Check out the Symphony of Science website for MP3 downloads, lyrics, and more info.