China Hosts an Epic Marathon Atop its Great Wall

Today on CNN10: We'll get the latest on a massive storm system battering much of the Central US with severe weather including more than two dozen reported tornadoes in recent days. Then, we'll head to China's Great Wall for a look at a one-of-a-kind marathon atop the historic marvel. Plus, we'll see how a paleontologist in the world's richest dinosaur graveyard is piecing together history, bone by bone. All this and more on today's CNN10!
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