An aritst, a writer, a mathematician and a physicist where travelling together on a train in Scotland. The artist looked out the window and saw a lamb grazing on a hill side, and exclaimed, "all the sheep in Scotland are black!" The writer responded, "no, only some of the sheep in Scotland are black." The mathematician chimed in, "no, you only know that one sheep in Scotland is black." Then the physicist said, "actually, my friends, all we really know, is that one sheep in Scotland is black on one side, some of the time!"
To my mind there must at the bottom of it all be an utterly simple idea. And to me that idea, when we finally discover it, will be so compelling, so inevitable, so beautiful, that we will all say to each other, 'Oh, how could it have been otherwise?'" -- John Archibald WheelerProbably the most exciting aspect of physics today is the worldwide race to develop a unified field theory--a single, elegantly simple expression of reality that will explain the working of the entire universe, form the wheeling of galaxies to the quantum jumps of electrons.... (from the Teacher's Guide.)
Here is an extension on the "world's simplest speaker" demo. It's
a lot of fun, simple, cheap, and they work! Your students can make their own.
Just click the picture :-)