" It's like, "Come to think of it,". (now that I ponder the matter) Edit . I should say that "come to think of it" may refer to a personal recollection, while "when you think of it" implies that anyone who considered these matters would come to the same conclusion.
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Avangi...meaning "when you think about the subject we're discussing"So it would follow that 'it' in that text refers to 'what the greatest invention of humankind is', which itself is not really written in the text, because it's the subject the author is talking about, right?
Taka So it would follow that 'it' in that text refers to 'what the greatest invention of humankind is', which itself is not really written in the text, because it's the subject the author is talking about, right?Right, IMHO.
AvangiThat is, you're about to add a new thought, rather than simply rehashing what's gone before.Adding a new thought is already implied in 'when you think about,' I guess.