Random forces usually have a destabilising effect. A tightrope walker would rather not experience gusts of wind, for example. There are, however, cases where random forces can stabilize a system in state that would otherwise be unstable. The essential ingredient is...
Electrons carry both a charge and a magnetic moment, and the collective way in which electrons behave leads to the familiar electrical and magnetic properties of materials. Isolated electrons are fundamental particles, in the sense that they are believed to be...
