When my partner turned 21 his friends gave him a large roll of number 8 wire and a large pot of fibreglass because then he had the means to fix anything. Poor old guy is turning 60 this year, and is not well enough to use those things now.
When I was in Jr. High School, one of the class geniuses figured if he wrapped a coil of copper wire around his finger and stuck his finger in his ear, he could listen to the radio during class. Didn't work. Maybe he used the wrong finger.