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<p>[QUOTE=&quot;desertgem, post: 2997737, member: 15199&quot;]Mostly just coincidence concerning the date. There were over 1 billion of 1957-D cents produced. The vast majority were to the western parts of the US. This was also the year sputnik was launched and jump-started the US education towards the sciences. The western US , especially California, introduced many Math, Chem, Physics courses, and this was the type of chem experiment that took little equipment, few chemicals, and was not really dangerous as long as the student didn&#039;t drop a beaker of boiling water with dissolved chemicals. Since the &#039;silver&#039; ( actually zinc) could be continued with a bunsen burner to a fusion of the zinc with the bronze and producing a thin coat of bright brass ( Gold cent), it was a &quot;student pleaser&quot;. It was mainly known to only high school and college chem teachers, until the internet hyped it up. I am sure my students have released multitudes of them into general population.[/QUOTE]</p><p><br /></p>

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