Shovel — ancient as the world, the instruments of labor. The design of it worked for centuries, and new, it would seem, not to invent. However, enthusiasts no-no and suggest something: the shape of the blade will change, then the stem, then attach the extra handle. Here’s one of those pens. Bolted to the big shovels shovel, it makes the job less tiring, and hence more productive.
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Remember, what is the simplest electrical circuit? The galvanic battery and light bulb connected by conductors through the switch (see the article "Ohm's law" in the "M-K" N2 9, 1978)....
