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Rails said..
Strange that helium + exit = suicide
must be trending
As for helium, it is lighter than air
Yeah that's what I though... very bizarre correlation there...
As for "lighter",
OK, but why ? 
(Short explanation of how religion
probably came about...)
I explained that the balloon "floats" in the air in the same way a ball of air would "float" in water. (Density)
OK, but why dad?Thus explaining that Helium is "lighter" than Air (Mix of Nitrogen, Oxygen and others) due to its molecular weight being lighter (Intro to elements, periodic table etc, stratification of elements in the atmosphere)
The sun creates the elements. Hydrogen, Helium, etc
So if the helium is the second lightest, why doesn't the balloon float in to space?The balloon will eventually pop.
Why?Pressure. As you go higher there is less pressure and the balloon will expand to try to equalise it.
So don't put as much helium in the balloon.You couldn't put a small enough amount of He in a balloon at sea level for it to expand and not break in the vacuum of space AND overcome the weight of the balloon to get to space. Therefore it will pop eventually.
So then the helium will be free to disappear into space?Ummmm no, it stays in the atmosphere... I think..., wait... lets GTS son.
...and if the Sun creates all the elements, then the elements must be able to float in space to get to become the planets?God did it.
What?God did it, in umm, seven days. Now eat your breakfast.

He's a very curious and logical boy