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Oldest DNA Ever Found Reveals Secrets of the Ancient Arctic

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NOVA

The Area of a Circle, Explained with Pizza

One of the oldest calculus problems, finding the area of a circle, can be visualized using a pizza. By dividing it up into ever smaller slices and laying them out next to one another, eventually you get something close a rectangle.
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B-29 Frozen in Time
53:54
Season 23 Episode 3
B-29 Frozen in Time
In Greenland, a deserted B-29 bomber awaits rescue for more than fifty years.
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