Back in 2007, Mark hit on Don Wilkes’ 1960s invention (U.S. patent #3,452,175) of the so-called “rolamite”over at boing-boing, quoting a description of it as “the only ‘basic mechanism’ invented in the 20th century.” Basically, a rolamite is a very-low-friction bearing. Rex Research has posted the entirety of a 1966 Popular Science article covering their invention, but the easiest way to understand what a rolamite is and how it works is to see one in motion. The above YouTube video, by user AutogenicMotor, shows the action of a simple linear rolamite, and the one below, by ErikBrinkman1, of a more complex rotary model.