Research has revealed that children resulting from marriage between cousins may help to preserve family health in certain ways, while risking birth defects in others.
Until recently, average incomes in advanced countries were increasing at much faster rates than in the rest of the world.
One in eight adults who are infected with SARS-CoV-2 experience long term symptoms due to Covid-19, according to one of the most comprehensive studies on the viral disease to date published in The Lancet journal on Friday.
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