The Download: growing threats to vulnerable languages, and fact-checking Trump's medical claims

Plus: Huntington's disease has been treated successfully for the first time. Wikipedia is the most ambitious multilingual project after the Bible: There are editions in over 340 languages, and a further 400 even more obscure ones are being developed. But many of these smaller editions are being swamped with AI-translated content. Volunteers working on four African languages, for instance, estimated to that between 40% and 60% of articles in their Wikipedia editions were uncorrected machine translations. This is beginning to cause a wicked problem. AI systems learn new languages by scraping huge quantities of text from the internet.