Alright kids, break's over.
* TearUtsuho raises her hand* They never even taught the germ theory to my class, the teacher said "it's to complicated for you runts" and such. But I'll guess at why they don't live in Shangri-La, they didn't want to anymore, the decided to pack up and move somewhere else.
Nope. But a good guess.
Now, don't feel too bad for not getting this one. They hid it real well. The reason why Shangr-La isn't inhabited anymore? Bullshit. It's inhabited. Just we can't see 'em anymore. You know how they tell you germs make you sick? That's only half true. What they don't tell you is that "germs" are actually the Shangri-lites. They realized, nigh on fifteen thousand years ago, there was no way they their civilization was ever going to survive as it was. So they micronized themselves, and became what we call germs. Not only that, you know that mitochondria shit? That's them too.
That's why you can't go to Shangri-La; they'll get you something fierce if you don't have a hazmat suit. And they place was long mined out, so there's no reason to go anyways.
Think about it; there's never a fossil from before then with obvious signs of disease, ever. Oh, sometimes they'll make a fake one, but even then they don't show 'em off. Those germs are people, people who forgot long ago there was every a world on our scale. And you know what, if you ever figure out how to talk to 'em, we'd solve disease forever.
* Doctor Purvis MFD takes long drag on cigarette, flicks the butt into the corner.
And they were right. Someday, we're all gonna have to join 'em.
Next question: Are there people on mars or not? Go.
Wait, there's a new teacher? Am I even in the right class?!
It may not be the class you're supposed to be in, kid, but it's the right class.