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E.T. Do Math

No one knows for sure if intelligent extraterrestrial life exists or ever existed. But many believe intelligent beings live elsewhere, despite a complete lack of compelling physical evidence. Why do s ...

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Hipervinculo Matemáticas

The Statistics of Sunspots

Sunspots are disturbed areas of the sun that look like spots because they are cooler than the surface of the sun. They have been observed and recorded since the 18th Century. This large collection of ...