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 diabetes drug finds a new purpose- No pain - or mucus - no gain- How to make cities of the future less noisy- A new reason for mysterious stillbirths- Making old mice younger with EVsAnd an honorable mention this week: How treatments for depression can change the structure of the brainLeaps.org is a not-for-profit initiative that publishes award-winning journalism, popularizes scientific progress on social media, and hosts events about bioethics and the future of humanity. Visit the platform at www.leaps.org. Podcast host Matt Fuchs is editor-in-chief of Leaps.org and contributing reporter to the Washington Post on health and technology.