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Physics articles from across Nature Portfolio Atom RSS Feed Physics is the search for and application of rules that can help us understand and predict the world around us. Central to physics are ...

Diamonds and other gemstones are weighed in metric carats: one carat is equal to 0.2 grams, about the same weight as a paperclip. (Don’t confuse carat with karat, as in “18K gold,” which refers to ...