The Friday Five covers five stories in health research over the previous week that you may have missed. 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.

Covered in this week's Friday Five:
- A new blood test for cancer
- Patch of bacteria uses your sweat to power electronic devices
- Researchers revive organs of dead pigs
- Phone apps detect cancer-causing chemicals in foods
- Stem cells generate "synthetic placentas" in mice

Plus, an honorable mention for early research involving vitamin K and Alzheimer's

Making Sense of Science features interviews with leading medical and scientific experts about the latest developments in health innovation and the big ethical and social questions they raise. The podcast is hosted by science journalist Matt Fuchs