Most words can be learned and taught most easily in groups, for example, words used by doctors, terms used every day by car mechanics, vocabulary typically heard in a lawyer’s office. Imagine a photograph of a scientific laboratory with captions on the key elements: test tube, bunsen burner, beaker, pipette, thermometer, technician, lab coat, goggles, periodic table, fume hood, centrifuge. A teacher can walk students through the lab, pointing out the most interesting sights. Quickly and naturally, children learn vocabulary, they have a glimpse of what scientists do, they learn about a new world that may excite their enthusiasm. Words...