;)
Hahaha, very clever, I must say. You want us to overthink this- try and correct every grammar ishue until it makes less sense and trick us into giving up- but it will not work.
Can there be a thing smaller than an atom? No, so this is nothing. Perhaps it was supposed to be translated to 'bigger than an atom'? Well, that is anything and everything. Does that narrow it down? Absaloutly.
It is the most cunning, strongest, highest, lowest, smartest- is it any or all? Only one thing goes with all.
Now, that answer- it's simple. What finds everything around you, can think anything, can be the most cunning, strongest, highest, lowest and smartest, and be filled with nothing, and, at the end of a life, be nothing?
Your mind, of course- your brain.
Am I right?