I'd say the easiest way to introduce it might be something like a bioluminescent bacteria or glow in the dark ink being tattooed into the skin. Bioluminescent bacteria could be produced by genetic engineering without too much problem, or for glow in the dark stuff, it all already exists, we just need a non-toxic one...

Well, nobody is really sure, as it's never been done. I'd guess that if it was connected to the nervous system, people could control it, but it would probably require some learning. Movements becoming instinctual would happen with time as you get more used to it.

It's certainly the least feasible out of them all :'(
Which is annoying as it's one of the ones I really want... Tsahaylu must be like nothing else imaginable, it must be so amazing to be able to fully connect with another person.

OMG I WANT IT I WANT IT I WANT IT!!!!11!11:D:D:D:D
Robot Tail - Silifulin - Demo Video | Geekosystem

I'm sure they could make an organic, more Na'vi-like version soon. ;)

I don't know about everything else, but the blue skin doesn't seem like a complex thing when you think about it. Naturally, if biologists and geneticists can alter the melanin from brown to blue in a person's DNA structure of growth, it can easily be done. However, the reason why the Na'vi are blue is because of their environment, of which I have no clue how it works. Max indicated they used this blue-tinted radiation, or light, or whatever it was, to illuminate the development pods so their skin would turn the natural blue it was supposed to be.

But I'm going to ask the question: why are the Na'vi so tall? Is it because of the lower gravity?

Hardly. More air pressure would, by definition equal more oxygen (ideally, 50% more), and causes taller growth. If the earth had some sort of crystalline cover, like a material canopy engulfing the entire planet, more air would be forced into the lungs, causing more oxygen to be distributed. This extra air would be ingested to produce more hemoglobin in the blood, making a human able to run for hundreds of miles without getting tired.

This same air pressure is being applied with hyperberic oxygen chambers, which most American football teams own for the sole purpose of healing the players. 50% more oxygen to the human body causes wounds to heal faster. It's also used for many other medical uses; one example I remember was a boy being treated for cerebral palsy with a hyberberic oxygen hood over his head.

Not only that, 50% more oxygen causes plants to grow phenominally bigger, producing many times its normal rate, with bigger fruit ("fruit" meaning whatever the plant produces). The animals would also be phenominally increased in size, and the lifespan of any animal would dramatically increase... as well as the lifespan of humans. For instance, being 200 years old in such an environment with a canopy over the atmosphere would be like being 25 now. Around 900 years would be the age where you look noticeably quite old.

I'd talk more about this, but I'd be getting into the "religious" realm, which is better suited for the.... science section. If you knew what else I had to say, you'd agree.

All in all, interesting topic! :)

Oh. My. Eywa.

Wantidy want want. :D

Genetically, there doesn't have to be such a reason - the average size on Pandora is much higher, so anything particularly small would simply be vulnerable and get killed fairly easily. Also, being ~4x as strong as a human and having carbon fibre bones allows them to support significantly more weight than a human.

DO WANT... If they do, I'm getting one implanted :D

Yeah, but there's gotta be a reason why everything's bigger on Pandora than it is here. Why didn't the Na'vi grow at our size? Why not 4 feet? Why not 15 feet? Why around 9 feet? If there's 50% more air pressure, that explains it, and at that particular height as well. At least, to me it does. :) Theories abound at why humans grew that high a few thousand years ago. We've discovered giant human skeletons before, one was about 9 1/2 feet. One skull had a jawline at 6 inches. No hoaxes; even 30 years after some of the remains being discovered, there haven't been any objections, let alone every other strange phenomenal human find. One skeleton was 12 feet, as I recall. I've got pictures. :) I'm just saying, if the air pressure were increased, so would the rate of growth.

That's why it came as no surprise to me when I read in the Avatar: A Confidential Report... book that similar conditions prevented humans from breathing, just because there were more amounts of other gases that the lungs couldn't process, thus taking in probably about 3% oxygen in one breath. That's why you're unconscious in 20 seconds (excess carbon dioxide) and dead in about 4 minutes (the brain can only function for about 4-5 minutes without sufficient oxygen to the average human). Sure, there are special cases of people who are trained to hold their breath for much longer, but they're holding their breath while slowly releasing, not breathing toxic gases at a constant rate; there's no app for that. ;)

The oxygen level is almost the same as Earth's, CO2 is toxic in itself at high concentrations, and Pandora has around 20%, more than enough to kill a person.

Anyway, I still want a tail :D