When a cat is dropped, it ALWAYS lands on its feet and when a toast is dropped, it ALWAYS lands with the buttered side facing down. Therefore, I propose to strap buttered toast to the back of a cat. When dropped, the two will hover, spinning inches above the ground, probably into eternity. A buttered-cat array could replace pneumatic tires on cars and trucks, and giant buttered-cat arrays could easily allow a high-speed monorail linking New York with Chicago.