A blackboard at a U.K. university is believed to be the only one of its kind that has both Albert Einstein's scientific notations and his signature.

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Explore how gravitational wave observations not only reveal exotic cosmic objects but also offer a unique opportunity to test modifications to Einstein's theory of general relativity ...

We may earn a commission if you make a purchase from the links on this page. The Pixel 9 is coming March 26 with lots of potential and quite intriguing upgrades, elevating Google's classic affordable ...