(plural paradigm shifts) 1  A radical change in thinking from an accepted point of view to a new one, necessitated when new scientific discoveries produce anomalies in the current paradigm. ( US) A radical change in thinking from an accepted point of view to a new belief.
The use of IN GOD WE TRUST has not been uninterrupted. The motto disappeared from the five-cent coin in 1883, and did not reappear until production of the Jefferson nickel began in 1938. Since 1938, all United States coins bear the inscription.
The presidential coin was introduced in 2005 by an act of Congress. The program was scheduled to continue until 2016, when, the Treasury Department estimated, there would be an inventory of 2 billion unused coins. But don't despair for Grover Cleveland, or any other president who has yet to appear on a dollar coin.