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Make a rain detector with a few household items. A great project for the kids!
You will need a cup, a 9 volt battery, two paperclips, electrical tape, some wire, a light, and some salt. The only tools needed are a pair of ...
Bend the paperclips straight. Then put them along the sides of the cup so that they are touching the bottom, bend the excess over the edge of the ...
Sprinkle some salt in the bottom of the cup. This will improve the conductivity of the water. Then put a small amount of water in the cup, just ...
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