why did the back of the penny change
Penny (United States coin) The Lincoln cent is the current one-cent coin of the U.S. It was adopted in 1909 (which would have been Lincoln's 100th birthday), replacing the Indian Head cent. Its reverse was changed in 1959 from a wheat-stalks design to a design which includes the Lincoln Memorial (to commemorate Lincoln's sesquicentennial) and was replaced again in 2009 with four new designs to commemorate Lincoln's bicentennial. There are more one-cent coins produced than any other denomination, which makes the Lincoln cent a familiar item. In its lifespan, this coin has weathered both world wars, one of which temporarily changed its composition as part of the war effort. The obverse is the longest design used for any circulating American currency.
Penny (The Big Bang Theory) In the original, unaired pilot of the series, the conception of the female lead was very different. She was called Katie, and was envisioned as "a street-hardened, tough-as-nails woman with a vulnerable interior". Sheldon and Leonard would "approach her with honesty, to draw the real, sensitive Katie out".[31] The role was played by Amanda Walsh.[48] However, the test audiences reacted to the character negatively, seeing her as too mean. Because of this, the character was changed, and the role was recast.[31]