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"from amid the mad elements" [FIVE] 

At some point, we've all experienced the humorless, information-rich decorations of a classroom. From the instructive white and green cursive alphabet to the classic "Age of Reptiles" mural from the Yale University Peabody Museum of Natural History.

But the grand-daddy of them all has to be the Periodic Table of Elements. That multi-column, multi-row chart with all of the known elements, grouped by metals / non-metals, then further by subcategories such as alkalais, noble gases, etc. For those of us who are not predisposed to appreciate the logical arrangement of the elements on the chart (or even the logic of their abbreviations), there's always Tom Lehrer's "The Element Song" which sets the periodic table to the tune of "I Am the Very Model of a Modern Major General."

Meanwhile, at Baker Street Elementary, the boys seem to be having a gas...

Baker Street Elementary follows the original adventures of Sherlock Holmes and John Watson, as they and their friends work through the issues of elementary school in Victorian London. An archive of all previous episodes can be viewed at www.bakerstreetelementary.org.