Ralph Mitchell, Harvard University (image) Harvard University Caption Ralph Mitchell in his lab at the Harvard School of Engineering and Applied Sciences. Mitchell, an expert in cultural heritage microbiology, believes that a "fingerprint" left by ancient Egyptian microbes may reveal a new secret about King Tut's burial. Credit Eliza Grinnell, Harvard School of Engineering and Applied Sciences. Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.