Whatever tech we've managed to develop, most certainly got an assist from the Nazis, at the very least. It wouldn't surprise me to discover that we've also reverse-engineered some downed UFOs, either...or gotten an alien assist.

At this point in the plan, there's not much that I wouldn't consider...

"Alice laughed: "There's no use trying," she said; "one can't believe impossible things."

"I daresay you haven't had much practice," said the Queen. "When I was younger, I always did it for half an hour a day. Why, sometimes I've believed as many as six impossible things before breakfast."

-- Through the Looking Glass.