The Basics of Electromagnetic Forces

We discuss the basics of electromagnetic forces. What is an electromagnetic field? Can you make a magnet by smacking a metal pole with a rock? How does a medium affect an electromagnetic field? Why does it travel in waves? How does electricity work inside your house? What's a coaxial cable? Why does your hair stand on end when you're close to a lightning strike? Does temperature affect electricity? What's a superconductor? Why does the dentist make you wear that silly vest when taking x-rays?