Physics, astronomy's dutiful daughter, suggests that theobject that people callthe universe, vast though it is, may be just one of an indefinite number of similar structures, governed by slightly different rules from each other, that inhabit what is referred to, for want of a better term, as the multiverse.
Many reform opponents cheer loudly to thecall for shutting down bad charter schools, but then object to the idea that poorly performing public schools should be shut down.