t's hot. But you can even create—I think I have this right—a U-shaped tunnel or a U-shaped hole. And if it's U-shaped, you can pump your own water into it. It becomes superheated because it's so far down in the earth, and then when you pump it up the other side, heated water. So you get your energy for free even if you didn't have a source of water at the bottom of it.

Now that's one of them. There's another one where they drill more sideways than down, and somehow that gives them some advantage. But the point is there are several now geothermal alternative methods. One is like fracking. So there's the standard, there's the fracking, there's a U-shaped, at least one other. And geothermal is almost unlimited. So all we have to do is figure out sort of incrementally by trial and error which ones of these works better and tweak it a little bit, and it could be that geothermal is the biggest energy of the future. That would totally be possible because nuclear is always going to be dangerous, you know, with its own—well, it'll always feel dangerous and take a long time and be expensive.

Elon Musk says that solar will be the main source of energy in the future. I say that's true if we get our battery storage right and our grid right. All you'd have to do is put solar on every roof and you have energy everywhere. You just need to be able to use it locally. Right now we don't have the grid to do that, but it's getting there.

Well, speaking of Elon Musk, on CNBC Ron Baron, who's a famous investor kind of guy, was talking about Tesla stock and he says that the stock price now of Tesla is about the same as it was three years ago. And he says he thinks it's going to be worth $5 trillion in 10 years. $5 trillion. We do have a few trillion-dollar companies—like one trillion just recently—but $5 trillion in 10 years. And then that's just the first part. I'm not done yet, right? That's what the investor thinks. He says Elon believes that even longer term it could be $30 trillion. He thinks the robot is going to be his biggest business ever. And then Ron Baron ends with, "No way I'm selling Tesla now." I own Tesla stock, so that's my full disclosure. So don't buy any stocks or do any investments because of something you heard on this show, right? It might sound like a good idea, but I assure you I'm not that good at investing that you should follow my lead.

I'll tell you what I'm doing because it's part of disclosure and it's also part of how you think about it. So if I tell you something, it's because it's more about teaching you some concept of investing. For example, I have—the smaller part of my portfolio has some Bitcoin and some Nvidia and some Tesla stock because those are three things that could go through the solar system. I mean that they could go so high it'd be crazy. But I wouldn't put 90% of my money in those things. So there's your finance lesson. You want most of your money to be in things that you think are diversified and are going to be fine, like the index of the Fortune 500, for example. But you might want a good solid 10 to 20% in a little basket of things that if any one of them went big, it would go so big you couldn't even believe it. That's what Nvidia and Tesla and Bitcoin all have in common. If they go big—and they're already pretty big—there's almost no limit. It's just an almost uncapped potential. You don't see that. That's not something you're going to see if you invest in Coca-Cola or even Apple Computer. So yeah, these are really, really special kinds of things.

I also have an investment in—I think it's the NLR—it's an index of nuclear power technologies and companies. That one, I don't know how fast it'll grow, but I like the idea of it. Anyway, again, I don't recommend these stocks. These are not recommendations. These are lessons.

Let's see. Apparently major companies are returning to advertise on X. So IBM, Disney, Comcast, Warner Brothers Discovery, and Elon is thanking them all. So apparently the fact that X is just an excellent place to advertise compared to the alternatives—apparently because one assumes that they wouldn't be coming back unless advertising there worked. I think bang for the buck is probably among the best places to advertise. I would guess. I'm no expert, but I'll bet that's true.

Now I told you that solar might be the new power of the future, but only if you can store it in batteries, which means you probably need more lithium for your robots and your cars and all that. Well, according to New Atlas, there's some new research at Rice University where they can grab almost all of the lithium from geothermal sources. Oh, geothermal again. So apparently geothermal that has brine in it—salt brine—has a lot of lithium in it, and they figured out some new technology to get it out of there. It looks like they built a three-chambered reactor that has a newly developed lithium-ion conducted glass ceramic membrane. So it looks like they're using some kind of a filter to just sort of filter it down electronically and otherwise.

So these are small technologies, but if any one of these makes lithium really cheap, everything changes. Imagine if the cost of lithium just went down 90% because somebody built a better filter to take it out of the ground. That's the sort of thing that could happen. Like just you wake up one day and lithium is 90% less. Could happen.

SciTech Daily says there's some weight breakthrough. They found some natural compound in your body. If they give you a little bit more of it, you're not hungry. I guess it affects how your brain registers hunger. So Baylor College of Medicine, th