 Hello, I'm Claudia Hammond. Now, I've been released from the Health Check studio to come to the Royal Society Summer Science Exhibition in London. I'll be looking at the latest medical research and asking what it means for the rest of us, from clever bandages that emit light to target cancer treatments to a blood test that might have been able to predict who was going to become seriously ill when they caught COVID. And how much can the brain devices we can buy online really tell us about our brain activity?