Just before death you are granted one truthful, understandable answer to one question. What would you want to know?
Obviously a hypothetical scenario. There is no way to pass on the knowledge to anyone else. Time freezes for you only, and once you have your answer you are out of this world.
The question can allow you to see into the past, present and future and gain comprehension of any topic/issue. But it's only one question.
Edit: the point isn't "how to cheat death". You can't. Your body is frozen and there is nothing you can do with this knowledge other than knowing it, and die. So if you would rather be frozen in a limbo just thinking of numbers for eternity, be my guest.
Such a variety of replies, it's been really interesting to read them!
What would you want to know? Personally I'd want to see a timelapse or milestone glimpses of humanity's future until the end of Earth's existence (if we survive that long)
Answer: "you can't." And you just wasted your question!
Well if that's the real answer, then any question at all would be a waste.
That's not true! Getting an answer to something doesn't necessarily mean the thing you're asking about is possible. You could ask me how to split myself in half and become two people, and I'd say (within my knowledge) it's impossible. But if you ask me how computers can show a pixel on the screen, I can give you a detailed answer. Either way, I'm answering your question, just perhaps not satisfyingly.
The point of this post is to see if there is any piece of knowledge you'd like to acquire, just for the sake of knowledge and not for any practical use. It's perfectly valid to say knowledge is worthless and pointless without any applicable use, I take that's your stance. Lots of opinions in this thread, it's been interesting to read all these replies.