Lets make Friday 'Joke Day'!

https://www.mentalfloss.com/article/54580/11-professors-best-inventions-gilligans-island
"In "X Marks the Spot" from the first season, the Prof fashions a battery charger out of coconut shells and seawater. In fact, he details the whole process, just in case you want to give it a go. Let us know how it works out for you.

"We need coconut shells, seawater, metal strips, pennies.The pennies are held in the seawater by the hairpins. The wire coming from the pennies leads to the positive pole of the battery. Metal strips on the other side of the coconut, lead to the negative pole of the battery. Now, everybody get ready to stir their coconuts, when I get the battery hooked up."

And that is how the castaways get the radio running just in time to learn that there's a nuclear warhead coming their way."
 
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I think the minimum starting rpm is 1500RPM and then they have to sit on the ramp for over 10 minutes with it running.:)
 
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