Here's a fun demonstration device to illustrate that like charges repel, and unlike charges attract. I call it a modified electroscope.	Use a 35 mm film canister. Drill a hole that a straw fits snugly through. Wrap it with a small piece of Aluminum foil, shiny side out.

Find the drilled holes by rubbing the fingers over the foil and feeling the dimple of the hole. Insert a pencil to puncture the foil to enable the straw to be inserted. (Alternative - use a larger piece of foil, roll into a ball, and use a pencil to make a hole through it.)	Make two small cuts in the straw end for the thread to sit in.

Use a packing peanut and tie sewing thread through the hole.	Drill a hole in a small block of wood as shown above. Slip the straw through the foil covered film canister, and position as shown. Tie the thread to the packing peanuts and insert the thread into the cuts made in the straw.

Rub the 12" long 1" diameter PVC pipe with a cloth. Charging by rubbing means electrons will leave the cloth, and go to the PVC, leaving it with an excess of minus charges - electrons. Rub the PVC on the foil covered canister, and it will charge negative along with the peanuts. It may require several tries. The peanuts will repel out.

The white PVC plumbing pipe is easily available. The rod becomes charged negative by rubbing with a cloth, a sock, wool or cotton will do fine. The electrons leave the cloth to accumulate on the rod. The cloth is left positive. Rub the rod on the foil slowly, It will charge the the foil and the peanuts negative, and they will repel. Put the cloth up near the peanuts and they will be attracted to it. If you rub a clear plastic rod, acrylic, it will be charged positive. The charge is dependent upon the material used.