Game: Which Knot is Strongest? (IMAGE) Johns Hopkins University Caption The researchers showed participants four knots that are physically similar but have a hierarchy of strength. People were asked to look at the knots, two at a time, and point to the strongest one. The strongest is A, the reef knot. Credit Khamar Hopkins/Johns Hopkins University 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.