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You have to know the past to understand the present.

More Carl Sagan quotes

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Personally, I would be delighted if there were a life after death, especially if it permitted me to continue to learn about this world and others, if ...

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Adolf Hitler! Ken, it makes me furious. Forty million people die to defeat that megalomaniac, and he's the star of the first broadcast to another civi...

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Books permit us to voyage through time, to tap the wisdom of our ancestors. The library connects us with the insight and knowledge, painfully extracte...

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One of the saddest lessons of history is this: If we’ve been bamboozled long enough, we tend to reject any evidence of the bamboozle. We’re no longer ...

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Advances in medicine and agriculture have saved vastly more lives than have been lost in all the wars in history.