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:

- An mRNA vaccine that works against cancer
- These cameras inside the body have an unusual source of power
- A new theory for what causes aging
- Can bacteria make you excited to work out?
- Why women get Alzheimer's more often than men

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