Evolutionary Time Machine (IMAGE) University of Texas at Austin Caption By freezing samples of bacteria grown over tens of thousands of generations, scientists could go back in time to reconstruct how different strains evolved. Credit Jeffrey Barrick/Univ. of Texas at Austin Usage Restrictions None 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.