14-07-24 DNA has the nasty habit of getting tangled and forming knots. Scientists study these knots to understand their function and learn how to disentangle them (e.g. useful for gene sequencing techniques). Cristian Micheletti, professor at the Internation...

14-06-24 A countryman from the state of Lu sent to king Song Yuangong two knots that were difficult to untie. The king posted a notice to find people with wisdom to undo the knots, but nobody could undo them. Later one of Er Shou's students untied one of the...