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The uranium-238 in the coral eventually decays into the more stable thorium-230, at a known rate.
Sharp used a mass spectrometer to measure the ratio of uranium to thorium in the coral and then, with a single age equation, calculated when the coral first grew on a reef. Some fell within a tight time span of just 30 years.
Chemistry is the reason the saying, "Love is blind," exists.
There are various psychological, physical and emotional symptoms of having good chemistry with another person."Corals are ideal materials for this kind of dating," says Sharp."They take in uranium from the seawater, but not thorium." Therefore, the coral would have stopped taking in uranium at the moment it was pulled from the sea.Other physical symptoms include "blood pressure go[ing] up a little, the skin...flush[ing], the face and ears...turn[ing] red and...[a] feeling of weakness in the knees".One can feel a sense of obsession over the other person, longing for "the day [when they return] to that person".