A study that stoked enthusiasm for the now-disproven idea that a cheap malaria drug can treat COVID-19 has been retracted — more than four-and-a-half years after it was published 1. Researchers had ...

Once upon a time, university lectures were accompanied by the sound of pens scribbling on paper. But if you go into a lecture hall today, you will hear students tapping on laptops. Devices are now an ...