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Records show that the ancient Greeks seemed unsure about the status of zero as a number... They asked themselves, "How can nothing be something?", leading to philosophical and, by the Medieval period, religious arguments about the nature and existence of zero... and the vacuum.

history of zero

From what I understand, zero is only a placeholder... "Zero" itself is only a representation for the absence of something, which of course cannot be otherwise spoken of. What "zero" does for numbers, "nothing" does for language...
But even as the concept of nothing seems simple enough.. actually seeing or encountering "nothing" is a very very difficult task.

Some may say that it's not difficult at all.... It's impossible. I suppose if you are talking about meditation then one goal is to experience and absence of thought, which some would call "nothing," but overall this whole thing is stupid... I mean does "nothing" really need anything more than to be left alone?