Drugs from Dirt (IMAGE) Rockefeller University Caption Soil is a rich source of bacteria, some of which produce molecules that act as natural antibiotics. Credit Jacob Arthur Pritchard for The Rockefeller University Usage Restrictions Image may be used only to illustrate the research described in the accompanying release. License Licensed 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.