(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.
From 1837 through 1964 the silver percentage was 90%. From 1965 through 1970 half dollars and silver (Eisenhower) dollars were made with a core of 21% silver, clad with an outer layer made from 80% silver. From 1971 through the present the US Mint has produced no coins for circulation that contain any silver.