When a cat is dropped, it ALWAYS lands on its feet; and when 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.