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Maybe, the author is thinking that we don't have "sufficient" knowledge and discovery about universe to build machines to answer these kind of questions.

Or, it may be a question that couldn't be answered in any way, so they were facing with a error(?) after asking "the question".

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Maybe Asimov tries to show us that what we think is insufficent isactually sufficent. All we have to do is look on the right perspective.

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Maybe it shows that there is so many things that are not known about universe.

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Maybe he is trying to tell us that we can never be enough for everything so we are insufficient.

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I think the author wanted to make us worried about nothing is enough with using the word "insufficient" repeatedly

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The life is insufficient for the characters.

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I think the word "insufficient" is being used repeatedly to tell us that no matter how much we improve ourselves, develop our society and technology there will always be such kinds of things that we will be insufficient to solve and understand. It won't really matter for us to develop such great computer machines or other things there will always be a limit for us.

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In the story we see that Asimov used the word “insufficient” repeatedly.I think it means nothing is enough for us and for our universe everything will end one day. Nothing will last forever.

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In the book we can see that the author used the word "insufficient" repeatedly. According to my opinion the author is trying to emphasize the difference between human and a computer with this word. Because scientist talk and try to find a solution with data that they have. However when they ask t the computer it says insufficient data. It can't think like a human but humans still expect an answer from a computer. It is like a ironi ı guess. In addition, it can be refer to the condition of the world. Insufficient data because the end of the world up to we.

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Because in the book all the characters know that the energy that they are using will be gone in the future, and it is insufficient for them continue their life for forever. Also, the main conflict in the story is that energy is the limited for a infinite human being.

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Maybe he want the make us feel that the boundaries are not enough for him and never will be.

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The message that Asimov gives with using the word "insufficient" repeatedly is there is not a solution for saving things(Reviving genereal universe, stars.). In the story we can see all computers until page 11 says that there are insufficient data for solving the problem of stellar energy depletion.

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trying to show that living organisms will be not enough for solve the universe

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To signify that everything in the universe is never enough and never will be enough

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Maybe he try to tell that liveable areas are not enough for us. And we can see the in the story.(?)