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2. Ring cent - Wikipedia

   en.wikipedia.org/wiki/Ring_cent

   The ring cent or holey cent was a one-cent pattern coin first struck in various compositions and designs between 1850 and 1851 as part of an experiment on producing a cent with a reduced weight and diameter, as the rising price of copper had caused cents to cost more than their face value to produce.

3. United States Mint coin sizes - Wikipedia

   en.wikipedia.org/wiki/United_States_Mint_coin_sizes

   Seven distinct types of coin composition have been used over the past 200 years: three base coin alloys, two silver alloys, gold, and in recent years, platinum and palladium. The base metal coins were generally alloys of copper (for 2 cent coins and lower), and copper/nickel (for 3 and 5 cent coins). Copper/nickel composition is also used for ...

4. 13 Best Places To Turn Coins Into Cash for Free - AOL

   www.aol.com/where-cash-coins-free-214605501.html

   This article originally appeared on GOBankingRates.com: 13 Best Places To Turn Coins Into Cash for Free. Show comments. Advertisement. Advertisement. In Other News. Entertainment. Entertainment.

5. Coin rotation paradox - Wikipedia

   en.wikipedia.org/wiki/Coin_rotation_paradox

   The outer coin makes two rotations rolling once around the inner coin. The path of a single point on the edge of the moving coin is a cardioid.. The coin rotation paradox is the counter-intuitive math problem that, when one coin is rolled around the rim of another coin of equal size, the moving coin completes not one but two full rotations after going all the way around the stationary coin ...

6. Are banks the best place to cash in your coins? - AOL

   www.aol.com/finance/banks-best-place-cash-coins...

   How do I turn my Coinstar coins into cash without a fee? The only way to avoid a fee through Coinstar is by turning your coins into a gift card. You can choose from popular brands like Amazon ...

7. Coining (mint) - Wikipedia

   en.wikipedia.org/wiki/Coining_(mint)

   The struck coin is fed into the machine and the machine then pressed the design into the edge of the coin. Sometimes a mint will use both methods to apply an edge design. The U.S. Mint, for example, used an edge incusing machine to letter the edges business strike presidential dollars and a collar for the proof versions of these coins.