Virginia mentioned a few items of history. Both then got their own history books and started to compare closely. They agreed on everything up to the moment of the atomic bomb at Alamogordo.
And at that moment, the histories diverged.
"Nature," said Ed Bronson, "must have been perplexed. So she took both roadways. One in which the earth is engulfed with atomic flame and one in which the thing worked."
"What do we do next?" asked Virginia.
"We get in touch with the respective authorities of our worlds," said Bronson. "Alone we can do little. Together we can do something to aid you."
"Tomorrow night at seven, then?" asked Virginia.
"Right."
The contact was broken.
"And there," said Peter Moray, "is our answer!"