Rapidly place a package of Menthos into a bottle of your favorite carbonated soft-drink. Stand back if you dont want to get soaked. Demonstrates catalysis of gas formation as the porous surface of menthos are a site of action for gas formation. (see at home experiments by Bill Nie...science guy).
Poster above...ARE YOU A HAM RADIO OP? I am...have an old 1950's VLF receiver, its cool..can listen to lightnen stricks, some airplane beacons, and i've been told brain waves..but never pursued it.