This song is stuck in my head for the last few days

I just wanted to share a song which is stuck in my head for a while now. Although this is not your typical melody, I must say I really enjoy listening to it. Furthermore, it features one of my favorite people who ever lived: Carl Sagan. If you have never heard of him you should know that Carl Sagan was one of the biggest scientists of the 20th century and one of the finest minds humanity has ever seen. Some of his ideas are very well illustrated in this song of his. So without any further adieu, take a look at this clip: