having never really tasted spoiled or unripe food, do they commonly taste sour rather than bitter? Does decomposition increase the amount of acid present?

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I was just sitting here contemplating the immortal words of Socrates who said, "I drank what?"

"Think of the rivers of blood spilled by all those generals and emperors so that, in glory and triumph, they could become the momentary masters of a fraction of a dot." --Carl Sagan "Pale Blue Dot"