Researchers from Cardiff University's School of Engineering have developed a glucose monitor that doesn't require you to prick your finger. It doesn't even need blood after the initial calibration, because it uses microwave to keep track of your glucose levels. The device then sends the data it gathers to an accompanying app. Professor Adrian Porch, one of its creators, told the BBC that its microwave levels are very low and nowhere near what's used for cooking. "Think about a mobile phone," he said, "we're about a thousand times less than that level."