They've tested a couple of sword myths, including the ability to catch a sword between your palms, and others.
The one in question was "An especially sharp sword is capable of cutting through another." They provided reinforcement through scenes of a couple Hollywood movies, in which one swordsman cleaves his blade through his opponents' blades, suffering no damage to his own blade.
The test basically consisted of construction of a simple arm-like apparatus that duplicated the mechanical swing of a human arm at the right angle, torque, and speed. The mounted a small variety of different types of blades (Eastern, Western, low end, higher end) in the mechanical hand, and then had them strike static swords (of equally various types), and filmed the results.
No sword was able to cleave through another sword; not surprisingly, both blades get damaged when there is blade on blade contact. Blades bent or even fractured from the impact.
Coldblooded357's critique is based on their selection of swords, in that they weren't of sufficient quality. However, the basic assumption of the myth is that a typical sword can cut another without damage. As such, their test incorporated much more than it needed to: the physics remains the same of clashing sharpened steel edges at strike velocities against sharpened steel edges: you damage both.
