In some cities, garbage was simply tossed out the window and covered periodically with dirt. During the Bronze Age in Troy, it is estimated that the street level rose an average of about 4.7 feet per century! Gradually, ancient cities like Athens and Jerusalem developed city codes regulating the disposal of garbage. About 500 B.C., Athens issued the first known edict against throwing garbage into the streets, and organized the first municipal dumps by requiring scavengers to dispose of waste no less than one mile from the city walls. In 1960, paper recycling in the US was born when the first papermill was establish by the Rittenhouse family on the banks of the Wissahichon Creek, near Philadelphia, PN. The paper at this mill was made from recycled rags. Napoleon has dinnerware made of aluminum. At this time, less important guests has to use gold and silver. In 1865, an estimated 10,000 hogs roamed New York City, eating garbage. Curbside recycling originated in 1874 in Baltimore. The first systematic incineration of municipal refuse was tested in Nottingham, England, in 1874. In 1889, a Washington, D.C. health officials wrote: "Appropriate places for [refuse] are becoming scarcer year by year...The waste must be provided for, and provisions should not be longer delayed. During WW II, salvaging metal straps from corsets saved enough metal to build 2 warships. As late as 1947, virtually 100% of all beverage containers were returnable. The first "architectural" use of aluminum was the cast 100-ounce tip of Washington Monument (which is still in place.) The compacting garbage truck, called the "Packer," was introduced in 1950. The all-aluminum can was introduced in 1964. The first PET bottle was recycled in 1977. In 1987, the infamous "Garbage Barge," the Mobro 4,000, sailed down the East Coast, through the Bahamas, to Belize and Mexico. The barge was refused permission to dock at each port. After 6,000 miles of sailing, the ship's load of trash was incinerated and the ash was buried on New Yorks's Long Island-where the garbage originated. In 1989, more than 90,000 African elephants were killed for their ivory. Even more countries prohibited commercial trade of ivory, pouching still occurred. However, the increased use of plastic as an ivory replacement has reduced the demand and price of ivory, making pouching less profitable.