Einstein's theories still hold up
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Einstein came out with some of the most remarkable theories in the history of science. Time being relative, gravity being a warping of space, energy and matter being equivalent. We take so many of his theories as being true that it's sometimes surprising to see that the theories are still being tested to see if they hold up under certain extreme conditions. And they do.
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I do wonder what would be next tho, since theories are transient. What could happen if a part of what we know was wrong all the way?