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If you appreciate ingenuity, simplicity, and like instant gratification from your radio projects, then you ought to spend a few minutes building your own foxhole radio. Foxhole radios were built by GIs in World War II from materials they had easy access to in the field. They usually consist of just a coil and a detector. They use a point detector, the chief component being an ordinary
Difficulty: Elementary school
My objective was to determine an optimal location for a gas-powered electrical power plant to help meet the energy shortfall in southern CA by building a mathematical model using linear programming.
Difficulty: High school
If the salt in the sea could be removed and spread evenly over the Earth's land surface it would form a layer more than 500 feet thick, about the height of a 40-story office building.
Difficulty: High school
I originally built this toy using a Canadian nickel coin. Canadian nickels are made of pure nickel, unlike U.S. nickels, which contain so much copper that they are not magnetic. You can build the toy with the nickel or with the Radio Shack rare-earth magnet.
Difficulty: High school
-grade science, "The learner will build an understanding of the lithosphere." It specifically addresses Objective 1.01, "Determine how physical and biological agents and processes form soil and affect soil characteristics."
Difficulty: Middle school
. Rather than trying to build a 2-volt, 200 ampere supply, there is an easier way.
Difficulty: High school
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