The Friday Five is a new series in which Leaps.org covers five breakthroughs in research over the previous week that you may have missed. There are plenty of controversies and ethical issues in science – and we get into many of them in our online magazine – but there’s also plenty to be excited about, and this news roundup is focused on inspiring scientific work to give you some momentum headed into the weekend. Covered in this week's Friday Five:- Puffer fish chemical for treating chronic pain- Sleep study on the health benefits of waking up multiples times per night - Best exercise routines for reducing the risk of mortality- AI breakthrough in mapping protein structures with DeepMind - Ultrasound stickers to see inside your body