Once you pop, the fun don't stop.

Procter & Gamble chose the name 'X' from a Cincinnati telephone book,

having been inspired by 'X' Drive in Finneytown, Ohio, due to its pleasing sound.

According to the patent, X were invented by Alexander Liepa of Montgomery, Ohio.

Gene Wolfe developed the machine that makes them.

'X' were first sold in the United States in October 1968, and

distributed nationally by the mid-1970s.

Here's a funny fact.

Their consistent saddle shape of X is mathematically known as a

hyperbolic paraboloid. It has been reported that their design is aided by supercomputers.

Identify X.