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Discover the latest health news, scientific discoveries and big ideas about the human body and treating diseases, covid-19, diet, fitness, exercise, wellness and how to live a healthy life.
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A special dye used in medical imaging cannot emit laser light by itself, but it will if it binds to proteins found in blood
As well as fertilising the egg, semen seems to prime a female's immune system, making it more likely that an embryo will survive