If Clint Eastwood did nothing else, he managed to mortally wound one of twentieth century culture's most sacred cows. It seerns odd now, more than thirty years after Dirty Harry changed their face forever, but there was a time when police were figures viewed...

Any shield that blocks electric fields is, in fact, a Faraday Shield, also known as a Faraday Cage. The basic concept of an electrostatic shield is that a metal member intercepts the electric field, which is trivial at audio frequencies. The Faraday Shield is...