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Restore a vintage power drill
My welding textbook said, don't use coat hangers as welding rods. Well, I hadn't thought of it until then... but with a car battery and a set of jumper cables and a coat hanger, you can make a pretty good bad quality weld. Which is often good enough.
I actually decided to quantify the effect; in a room that's about 12 by 12 with a ceiling that's 13 feet high at one end slanting down to 8 at the other, with the fan set to winter mode (blows up in the center, air comes down around the edges of the room) having the fan on would actually raise the temp at sitting height a couple of degrees, but it felt cooler, because of the moving air, even though it was not a direct draft. So I set the fan to move the air when I'm not in the room, but turn it off when I am.
OscilloPhone: Use your Smartphone as an Oscilloscope / Signal Generator
Low Waste, Simple, Rock Solid Workbench
Clever Ways to Store Tools