"The natural term of an apple-pie is but twelve hours. It reaches its highest state about one hour after it comes from the oven, and just before its natural heat has quite departed. But every hour afterward is a declension. And after it is one day old, it is thence-forward but the ghastly corpse of apple-pie."

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The first men who set out for Mars had better make sure they leave everything at home in apple-pie order. They won't get back to earth for more than two and a half years. The difficulties of a trip to mars are formidable. . . . What curious information will these first explorers carry back from Mars? Nobody knows-and its extremely doubtful that anyone now living will ever know. All that can be said with certainty today is this: the trip will be made, and will be made . . . someday.

— Wernher von Braun