Rachel Vreeman and Aaron Carroll weren't looking to start a controversy. They're both pediatricians at Indiana University who, as a side project to their day jobs, put together a study on a few medical myths that many doctors believe. The results weren't exactly earth-shattering: they revealed that you don't actually need to drink eight glasses of water and nails do not continue to grow after death. And the research definitely wasn't new. "We looked through old research and basically put it all together," explains Vreeman.