Meteorites (IMAGE) University of Cincinnati Caption A magnet holds tiny micrometeorites collected from sediment samples taken from an ancient Hopewell site. Researchers say this evidence points to a comet airburst that devastated parts of the Ohio River Valley more than 1,500 years ago. Credit Michael Miller Usage Restrictions None 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.