Hopper and Aiken (also USNR) used the Mark I to help the Navy produce tables for aiming artillery shells and bombs in the closing year of World War II.

Phelps, who won six gold MEDALS four years ago in Athens, is aiming to surpass Mark Spitz's seven-gold effort at the 1972 Munich Games.

Having a clear understanding of how and where to start is empowering and it will provide the extra drive needed to hit the mark you are aiming at and follow it through.