Plates (IMAGE) Penn State Caption Clara Shaw, a postdoctoral scholar at Penn State, who is starting a new position in January as an assistant professor at the University of Minnesota Duluth, noted that worms are a powerful experimental system. “You can have an entire population of hosts in a single petri dish, and you can fit 50 replicate populations in a space the size of a shoebox,” said Shaw. Credit Clara Shaw, Penn State Usage Restrictions Educational use only License Original content 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.