"Oh. Thank you."

"How much longer to the mansion?"

"Ah, sorry, we were talking..." zip. 

Zip!

"Lex! Julian!" she calls, stepping into the foyer. "You'll never believe what happened!" 

"I sincerely doubt that," a man with an unusually high baldness to age ratio says. "Who's this?" 

"This is Xan-El, he's from another timeline where lesbian superheroes won World War I and Krypton blew up several decades earlier! His birth parents' names match mine but he got a memory crystal instead of an asshole AI. It's 1968 in his timeline." 

"...Well, I wasn't expecting that. But I believe you." He stands up and offers his hand to Xan. "Lex Luthor. Pleased to meet you." 

Xan shakes Lex's hand. "Xan; I don't usually tack on the El. Similarly pleased to meet you. I'm told you have an R&D budget!"

"I do have an R&D budget. What are we proposing I do with my R&D budget?" 

“The answer is not ‘give it all to me’, you can relax. I have Kryptonian tech schematics in my head, courtesy of Jor-El’s memory crystal. Back home, I resigned myself to having to reinvent the wheel until I could build myself a computer that didn’t look like a Model T engine, but you have people. People who do this for a living, and more importantly, aren’t working out of an elderly couple’s barn. I’m not going to pretend I’m not a little self-interested; I want to get my hands on some of this tech, and I don’t want to have to solder all the chips into place with my own heat vision. But my self-interest is to your benefit.”

"...I didn't think you were going to try to extort me," he says, amused, "Clara wouldn't cooperate with that. 'You have the schematics for Kryptonian tech in your head' is the answer to the question I was asking. And is a very good answer."

“You didn’t think I was going to try to extort you, but the idea that I was going to scam you can’t have been far from your mind; you’re a businessman, and I opened with ‘I’ve got a brilliant way to make you some money.’ At any rate, yes, Kryptonian tech. A lot of the really interesting stuff depends on island of stability elements, but until they exist I can at least give you a massively unfair advantage in the field of consumer electronics."

"If you were going to try to scam me, you were hardly going to say so up front." 

Xan nods. "Anyway, I can talk to your people whenever, or if you'd like I can give you an overview in person first. I'm kind of excited about all this!"

"I would love an overview." 

Xan launches into an explanation of the basics of Kryptonian technology!

As he mentioned earlier, they relied heavily on island of stability elements for power and exotic effects. Krypton had deposits natively, but with a sufficiently powerful particle accelerator they can be home-grown. There are other potential power sources, though, from other galactic civilizations Jor-El had observed, some of which have less onerous requirements; they won't be making a Body-Mold or a stasis chamber any time soon, since those need the island of stability's weirder properties, but they can make some very nice things.

Kryptonian consumer electronics often had a holographic (or, in the higher-end cases, telepathic) interface, and served many functions. There's one device Xan is particularly excited to see implemented, which sounds like a cross between a phone, a personal computer, and a 3D printer. It straps to the user's off-hand, and projects a sort of holographic glove as its command interface.

As Xan expounds, Lex's face grows more and more interested. 

"I'm glad your Jor-El was more forthcoming than ours," he says when Xan's finished. "I can get a team of engineers ready within the hour. How do you want to tell them you know all this?"

"I can pretend to be an unreasonably lucky human," he says. "Touched a mysterious crystal, schematics seared themselves into my brain, the crystal broke? A Kryptonian-oriented telepathic interface presented with a human nervous system might actually do that, oversell the data and fry itself. It'd probably overwrite half of the human's episodic memory in the process, but they don't need to know that."

"Wouldn't be the first time something wacky happened to someone who came in contact with--well, something weird, they don't know about Krypton qua Krypton." 

"That... is good to know. Should they continue not knowing about Krypton, in particular as the source of this tech."

"It'd probably be fine, previously the only way to explain that Krypton existed would have ended with 'and I know this because I am a space alien' but if we're blaming it on a rock then that doesn't out anyone."

"Cool, I can say things like 'Kryptonian neurostructure' instead of 'the neurostructure of whatever strange alien race produced this miraculous technology,' that would get old fast."

"Do we actually have significantly different neurostructure?"

"Oh, sure. For one thing the solar energy accumulator organelles are woven in there, we get a surprising amount of feedback - that's why I sunbathe so much. For another thing, we've got more space - but humans have more flexibility, more redundancy, more adaptability. Some of the things you can do to a human brain and leave it still basically functional are horrifying. You ever hear about Phineas Gage?"