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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 main...

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 war...

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 whke 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 hoffma...

Commissioner Bernard Kerik who served time for tax fraud and lying to officials and the president just spoke about blagojevich moments ago. We have commuted the sentence of Rod Blagojevich. He served eight years in jail. Thats a long time, and i watched his wife on television. I dont know him very well. Ive met him a couple of times. He was on for a short while on like a very nice person. , seemed dont know him but he served eight years in jail. He has a long time to go. Many people disagree with the sentence. Hes a democrat. Hes not a republican. Got a lot of folks to talk to. Shimon prokupec...

At the heart of europe a region in change a country that took a long time to unify people who only stunted regarding themselves as german as the centuries progressed who were added they come from. The by law. Questions about the history of the german people. There is no mention of the germans in the tenth century the tribes of the bavarians saxon swabian franks are connected mainly by their language. A common external enemy strengthens their cohesion one who wants to seize the moment and rule is king over the german territories and as emperor over Christian Europe otto the first. Seven conting...