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My inner part is filled with helium
Rubber comprises my epithelium
If you tie me 'bout your hand
Then I'll stay closer to the ground
Else I'll go up to the sky
I am not a balloon, what am I?

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3  
@H.Modh I think the answer is more 'out of the box'. – Trevi Awater Jan 5 at 9:48
3  
To improve the rhyme, you could change the third line to "If I to your hand am bound". :-) – Hellion Jan 5 at 15:54
4  
is anyone else sick of all these "oh, just kidding, I was lying" riddles? – dfperry Jan 6 at 13:04
6  
What, really? REALLY? Man I thought about this all yesterday and wasted hours on research and brainstorming. And now my upvote is locked when I really just want to downvote this. I guess I've learned my lesson about upvoting questions here before I know the answer. I'm pretty sure I got here from the Hot Network Questions list, it has 1K views and it's not even a real riddle! What's next, "What have I got in my pocket?" – Todd Wilcox Jan 6 at 16:39
4  
@BigBlackBox While dmg's answer is likely to be the best one possible, it does not satisfy what to me is the core purpose of a riddle, which is that it's something that seems so obvious once you actually know the answer. dmg's answer doesn't really seem right. Only the helium and rubber parts of it work very well. As frustrating as this "riddle" is, "A balloon that lies" is a better answer than dmg's based on my criteria. – Todd Wilcox Jan 6 at 17:16
up vote 26 down vote accepted

Is it a

Portable hard drive

My inner part is filled with helium

Some hard drives are filled with helium to reduce internal friction

Rubber comprises my epithelium

Rubberized to prevent damage if it falls

If you tie me 'bout your hand
Then I'll stay closer to the ground

If you connect it to your PC it will be relatively close to the ground and at the tip of your fingers. Alternatively "grounding" the hard drive (credits to Adam Davis) or wearing a grounding wristband (credits to Dane Andersen).

Else I'll go up to the sky

Alternatively you can store all your data in the "cloud"

I am not a balloon, what am I?

A hard drive

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1  
nice one...!! @dmg – H.Modh Jan 5 at 11:50
9  
"Closer to the ground" might have more to do with electrically grounding the hard drive when connected to the computer than being physically close to ground. – Adam Davis Jan 5 at 13:58
    
@H.Modh Thanks :) – dmg Jan 5 at 14:34
1  
Some people use a grounding strap that you literally tie around your hand (wrist) to keep you grounded while working with electronics. – Dane Andersen Jan 5 at 16:04
2  
I don't know about this seems like a bit of a stretch, "else I'll go up to the sky" the cloud has little to do with a personal hard drive, and I know you say it's an alternative but there are plenty of alternatives to the cloud for your data. And the hard drive itself isn't going to the sky anyway the data is. – DasBeasto Jan 5 at 16:49

I think it is a

laser barcode scanner.

My inner part is filled with helium

Laser barcode scanners contain helium-neon lasers.

Rubber comprises my epithelium

The scanners have an external enclosure made of rubber.

If you tie me 'bout your hand
Then I'll stay closer to the ground

When one holds the scanner in their hand, it is aimed at the items in the checkout counter (closer to the ground)

Else I'll go up to the sky

When the scanner is left on the rack, the beam will point upwards towards the sky.

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I think the answer is

Lightweight aircraft

My inner part is filled with helium

Helium is used as a fuel (Reference)

Rubber comprises my epithelium

We have rubber band powered airplanes.(Reference)

If you tie me 'bout your hand Then I'll stay closer to the ground

If you have it in hand. It won't go up.

Else I'll go up to the sky

Possible reference to leave it after adding potential energy in it.

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10  
Helium is almost completely inert, and cannot be used as a fuel. It won't take part in any chemical reactions. The site you linked to is simply wrong -- they may have been confused by a proposal to use helium to reduce the weight of light aircraft and reduce fuel use. – Mike Scott Jan 5 at 13:34
1  
@MikeScott +1, but If you stretch the "fuel" idea to the limit, it can be plausibly used as a fusion fuel in the triple alpha chain. – March Ho Jan 5 at 14:20
5  
@MarchHo Got any examples of light aircraft powered by triple-alpha fusion? – Mike Scott Jan 5 at 14:50
3  
@MikeScott I might have forgotten to end it with /sarcasm. – March Ho Jan 5 at 14:52
2  
@MikeScott They seem to confuse hydrogen and helium several times. – GalacticCowboy Jan 5 at 16:05

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