"Pocket universe isn't really a wormhole," Henry said, but it wasn't an argument so much as a clarification, and he didn't voice the theory that Tony Stark had come up with, that Darrow wasn't even a pocket universe.

"And broadcasting isn't hard at all. We're all constantly broadcasting. Radio signals, microwaves, natural and artificial radiations, whatever. It would be a little more difficult to figure out how to direct it, how to tell if a signal got picked up--less radio signal, more phone call?"

Henry stared into his cup and shrugged.