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<p>[QUOTE=&quot;Gaidzahg, post: 8329287, member: 118556&quot;]Hello again and thank you!&nbsp; Glad to be here!</p><p><br /></p><p>The main use of the pennies is running experiments to show the different properties of copper vs. zinc.&nbsp; We compare their densities, their reactions with acid, their different melting points (a Bunsen burner is hot enough to melt zinc but not copper), and—if I can get my hands on liquid nitrogen—the different effects superlow temps have on malleability.</p><p><br /></p><p>The reason we have them separate them by year and mint is to then have them make a histogram, which they then analyze to answer questions like how does the frequency of a year change over time? or are there any years where it looks like something unusual may have happened? is the pattern linear or logarithmic? can you predict what the rarity of a particular year will be five years from now?&nbsp; and so on</p><p><br /></p><p>[USER=116892]@1stSgt22[/USER] I do talk about all that stuff with the ones who really show an interest.&nbsp; In fact, we have a small coin club that meets once a month and goes through boxes of pennies I get from the bank.&nbsp; Thanks for suggesting contacting the Mint for visuals, I&#039;m ashamed to say I never thought of that myself.[/QUOTE]</p><p><br /></p>

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