How long is an elephant pregnant for? While a female elephant is in labor, the other elephants in the herd protect her by forming a circle around her. Most elephants only bear one baby at a time, but twins occur in approximately two percent of elephant births.
This set the stage for the complete elimination of silver from our coinage by the end of 1964. Any United States dime, quarter, half dollar or dollar that is dated 1964 or earlier is made of 90% silver. In the dime series, all coins dated 1965 or later are clad coins and contain no silver at all.
Although the succeeding Ming Dynasty (1368 - 1644) also began by printing unbacked paper money, it suspended the program in 1450. For much of the Ming era, silver was the currency of choice, including tons of Mexican and Peruvian ingots brought to China by Spanish traders.