Funding for this program is provided by annenberg media. Narrator of all the planets in our solar system, none can support complex life except earth. But the conditions on earth were not always so suitable for life, and scientists are working to reconstruct the history of two essential requirements whicmake tlanet hatable. The first is free oxygen in the atmosphere. The other is a moderate and stable climate. Paleontologist andy knoll has spent much of his career examining earths rock record to piece together the history of early life and the rise of oxygen. Theres this close waltz, if you will, between the history of earths physical environments and the history of life. Narrator geologist paul hoffman studies the time in our planets history when the climate was much more extreme, a period called the snowball earth. Hoffman during the maximum cold of the snowball earth, you have an earth thats more like mars than it is like earth. Narrator hoffman is seeking answers to how the earth en
The other is a moderate and stable climate. Paleontologist andy knoll has spent much of his career examining earths rock record to piece together the history of early life and the rise of oxygen. Theres this close waltz if you will, between the history of earths physical environments and the history of life. Narrator geologist paul hoffman studies the time in our planets history when the climate was much more extreme, a period called the snowball earth. Hoffman during the maximum cold of the snowball earth, you have an earth thats more like mars than it is like earth. Narrator hoffman is seeking answers to how the earth entered this snowball and, more important for us how it returned to warmer conditions and has maintained a stable and moderate climate. Both of these scientists look to the deep past for clues to the present enriching our understanding of the one place we know in the universe where life flourishes earth, the habitable planet. Eahs inedlerr ofifntnima as, including human
Funding for this program is provided by annenberg media. Narrator of all the planets in our solar system, none can support complex life except earth. But the conditions on earth we re not always so suitable for life, and scientists are working to reconstruct the history of two essential requirements whmake tlanet hatable. The first is free oxygen in the atmosphere. The other is a moderate and stable climate. Paleontologist andy knoll has spent much of his career examining earths rock record to piece together the history of early life and the rise of oxygen. Theres this close waltz if you will, between the history of earths physical environments and the history of life. Narrator geologist paul hoffman studies the time in our planets history when the climate was much more extreme, a period called the snowball earth. Hoffman during the maximum cold of the snowball earth, you have an earth thats more like mars than it is like earth. Narrator hoffman is seeking answers to how the earth ente
[sticks clacking] [cultural music montage] what is music . Well, from a scientific point of view, its the organization of sound. [Classical Music] woman its a language without words, and the reason for language is to communicate and the reason for music is to communicate. woman depending on what you want to express, it can be hundreds of different things. man music is the essence of the creator, the entire universe. In my case, its the sounds that i make with my violin. There are people who go, thats not music. Music is music if someone thinks its music. You cant put it in a box and say, this is music. Its all these wonderful abstract things brought together. You can think about it and rationalize it and express it and explain it. Thats all afterwards. It gets you on an emotional level first. narrator while music seems to exist in every human society, its meaning and role differ from culture to culture. But the physical laws of sound are universal. At the root of all sound is vibration
To piece together the history of early life and the rise of oxygen. Theres this close waltz, if you will, between the history of earths physical environments and the history of life. Narrator geologist paul hoffman studies the time in our planets history when the climate was much more extreme, a period called the snowball earth. Hoffman during the maximum cold of the snowball earth, you have an earth thats more like mars than it is like earth. Narrator hoffman is seeking answers to how the earth entered this snowball and, more important for us, how it returned to warmer conditions and has maintained a stable and moderate climate. Both of these scientists look to the deep past for clues to the present, enriching our understanding of the one place we know in the universe where life flourishes eahs inedlerr of difntnima as, earth, the habitable planet. Including humans, is relatively new to this planet. Fossils contained in the earths vast rock record show that the first animals emerged a