It all started when Benji said he wanted to collect elements. Into my mind flashed a vision of a pile of random junk all jumbled together, at best contained in some large and battered cardboard box, that Benji refused to throw away. Benji would clutch every precious item to his chest and refuse to relinquish it because it contained, for example, phosphorus or selenium.
This unappealing vision nearly caused me to reflexively toss out a firm “no.” But I gave it a little more thought and came up with, if I may say, a moderately brilliant idea: Collect tiny samples and tape them to the old kindergarten science fair poster board. This, combined with Benji’s willingness to collect samples that contain an element, rather than pure samples, made the project possible.