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IE11 is not supported. For the best experience, please visit our site in a different browser. Now playing Reconsidering the mysteries of gravity 05:21 Source: www.nbcnews.com

We’re always working on it. But thinking, or how we should think about thinking, is surprisingly difficult to pin down. For example, when I did VoxPop,…

Astronomers using the NASA/ESA Hubble Space Telescope have captured sharp images of NGC 4689, a jewel-bright spiral galaxy in the constellation Coma. This Hubble image shows…

The survival of certain species during mass extinction events has puzzled scientists for centuries. Approximately 66 million years ago, at the end of the Cretaceous period,…