Two mathematicians have proved that a straightforward question—how hard is it to untie a knot?—has a complicated answer.
Learn how Hubble is measuring the expansion rate of the Universe in this new explainer from NASA's Goddard Space Flight ...
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♾️ From infinitely small to infinitely large: we've found the middle of infinities, and you can see it!
A common height that seems normal in our human-scale world. Yet, when we compare it to the smallest and largest conceivable ...
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