Listener Jason asks:
I've been wondering how a "Railgun" works? The US Navy has been testing these things as a possible replacement to conventional gunpowder based weapons.
I've also been wondering how does "Stealth" technology work as it applies to airplanes? And what sort of countermeasures can be applied to defeat this technology.
Paul Beale, physics professor at the University of Colorado (Boulder) gives us some answers. And see the cool videos below!