The ninja used short swords when faced with imminent danger, such as in enemy territory. We'll see when these were used, and how they differed from warrior's katana swords. Also, ancient ninja literature describes a water-crossing device known as "mizugumo." We'll do an experiment, constructing "mizugumo" exactly as described, to see if it really worked. And we'll get a ninja expert's opinions about how it could be improved today, and try that too! Join us to see the results!