This simple circuit can detect the invisible fields of voltage which surround all electrified objects. It acts as an electronic "electroscope."
http://www.amasci.com/emotor/chargdet.html
A hand-held electrophorus can produce significant amounts of charge conveniently and repeatedly. It is operated by first frictionally charging a flat insulating plate called a "cake".
http://www.ece.rochester.edu/~jones/demos/electrophorus.html
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.
http://members.aol.com/djadamson7/articles/foxhole.html
This project may require a trip to the store, some patience, and maybe a bit of help, but it's well worth it. After connecting all your wires and buzzers, you'll be able to “talk by lightning.
http://www.yesmag.bc.ca/projects/telegraph.html
Lightning is beautiful, dangerous, and mysterious. The same brilliant flashes that inspire poetry and paintings can cause city-wide power outages and raging forest fires.
http://www.yesmag.bc.ca/projects/lightning_pan.html
When you rub a balloon on your hair, it ends up loaded with electrons. Those electrons can attract the protons in a soda can, the protons in a trickle of water, the protons in your hair, or the protons in a wall.
http://www.exploratorium.edu/science_explorer/roller.html