? (I)

Hot enough to burn the skin, but not scathing

Interfere with the drop of a pin, watch it float lazily

Inconsistent with its complexion, maybe clear or hazy

Bland and lacking expression, reminiscent of a daydream

Made by the universal stuff that everything else is

Atoms with weaker bonds than half related kids

Kind of an awkward situation, but I guess I'll give you a hint:

Oxygen got attention of and cut off these two twins

Not a drug, though it seems like everyone's addicted 

Virtually free by the ounce, like everyone's drinking it

Regardless of size or the effort it takes to lift it

Costs less than a cent per ounce, essentially free like I told

Yet its entirety exceeds the net worth of the globe

And does so by about 100,000 times, superfluous overflow

So obvious it was forgotten, right over the calculator's dome

I think that's enough description, I thought of making it longer, but why bother?

Figured it out, but want to make sure your guess is right/proper?

It's the last word in the famous quote Bruce said: "__ ____ _____"