 Why was futuristic Jerome so sure that past Jerome would invite him inside?
You will, you know, so why quibble about it? Yes, it'll be pretty obvious it must be a time machine. You'll be puzzling over what I'll tell you, and you'll be getting used to the idea that you are the man who makes atomic power practical. Jerome Boell, just a plain engineer, the man who put atomic power in every home. "Maybe it's no dimension—or it might be the fifth; if you're going to skip over the so-called fourth without traveling along it, you'd need a fifth. I figured out once that such a universe would need some seven or eight time and space dimensions. Maybe there is no machine, and it's just easier for us to imagine it.
 Because he himself had done so already.
 Because he himself had done so already.  Because he can see into the future.  Because he knows that his decisions have been altered by the machine.  Because he can hear the inner thoughts of his mind