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Blair Hedges, Penn State
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Using coins for scale is discouraged as it will require people unfamiliar with them to look up the dimensions or guess, both of which defeat the purpose of the object in the first place. Coins can also reinforce a geographical bias, and some coins' designs are
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SI ("metric") units are the most commonly used worldwide (see
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{{Information |Description={{en|1=*Photo of
Leptotyphlops carlae on a US quarter. }} {{pl|1=*Fotografia
Leptotyphlops carlae na amerykańskiej ćwierćdolarówce.}} |Source=[http://www.eurekalert.o