This NY Times article on superstrings is most interesting, with multiple universes, metaverses, multi-dimensional spacetime, and the like. Superstrings are little vibrating packets of energy which are hypothesized to make up everything in the universe. How little exactly? According to a graphic accompanying the story, the size of a string compared with the size of an atom is the same as the size of an atom compared with the size of the solar system. That’s pretty small.