The Friday Five covers five stories in research that you may have missed this week. There are plenty of controversies and troubling ethical issues in science – and we get into many of them in our online magazine – but this news roundup focuses on scientific creativity and progress to give you a therapeutic dose of inspiration headed into the weekend.Here are the promising studies covered in this week's Friday Five:- A pill to prevent lung cancer? - Ancient wisdom about Neti pots could pay off for Covid- Breakthrough for precision medicine and obesity- How to refreeze the north and south poles- The connection between taking multivitamin pills and brain health