Centred on the University of Lille, France, in September 2022, a group of international researchers reported in the prestigious journal Science that the progressive devolution in mental abilities of people suffering from Down Syndrome (DS) could be attributed to an associated reduction in the production of a particular hormone. They based their assertion on the results of experiments they had performed on genetically engineered mouse models of DS and on a small group of adult human sufferers of DS, in all of which the levels of the hormone had been restored to normal by various experimental means.[1] The researchers report...