Two Kinds of Science-Fiction Innovations

Most common are the fictions that begin with Jules Verne, and concern the single artifact—a submarine, flying machine, or death ray—and its consquence for all of humanity. These extraordinary voyages—to use Verne's term—play along the fault line between what we think we are and what we can do. Nemo is no accident, or a tragic figure, but the natural consequence of the intersection between present-day humanity and extraordinary technology. Even 2001: A Space Odyssey plays on the same t...

 QED Explained

Feynman's graphical method provides a way of visualizing each term in the sum over histories. Those pictures, called Feynman diagrams, are one of the most important tools of modern physics. In QED the sum over all possible histories can be represented as a sum over Feynman diagrams like those below, which represent some of the ways it is possible for two electrons to scatter off each other through the electromagnetic force. In these diagrams the solid lines represent the electrons and the wav...