Abstract
Postage stamps constitute a simple yet effective way of commemorating events and educating the general public on a variety of subjects, including art, geography, history, and literature. Perhaps more surprising is that various topics in astronomy, biology, chemistry, and physics have also been showcased on stamps, even if in a somewhat more limited fashion. In this regard, a number of stamps depicting the periodic table, famous chemists, molecular formulas, and minerals have been regularly featured in the Stamps International column of this newsmagazine during the past four years. Since the International System of Units (SI) is now celebrating its 50th anniversary, this article pays tribute to the metric system and presents an assortment of postage stamps to highlight key aspects of its development and modern applications.
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