Jubal frowned.  Caxton said impatiently, "Teleportation, of course.  What's so hard to grok about it, Jubal?  You yourself told me to come down here and open my eyes and know a miracle when I saw one.  So I did and they were.  Only they aren't miracles, any more than radio is a miracle.  Do you grok radio?  Or stereovision?  Or electronic computers?"