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There are a lot of things in this world that people don’t understand because, hey, the world is a confusing place. But we can always take solace in the fact that there are some really simple concepts and ideas out there that we can all understand. However, as is often the way with life, when you start to look closely at some of these concepts, you realize that you’ve opened a giant can of worms. 这世界上有许多事情人们都搞不明白，哎，因为这世界就是一个容易把人弄糊涂的地方。不过，有一些概念和观念还是挺简单的，我们都能理解。藉此，我们总能感到一丝宽慰。不过，当你开始仔细审视其中一些概念的时候，你就会意识到，它们的背后还隐藏着一连串极为复杂的问题。而在生活中，这是常有的事。 10 The Proof For ’1+1=2′ Is 300 Pages Long 10 为了证明1+1=2，数学家用了300多页纸来计算 The equation 1+1=2 is probably the very first bit of math that most of us learned, because addition and subtraction are probably the simplest concepts in mathematics. If you have one apple and somebody gives you another, you have two apples. By the same logic, if you have two apples and someone takes one away, you only have one apple. It’s a universal fact of life that transcends barriers like language or race. Which is what makes the following sentence so unbelievable: The proof for 1+1=2 is well over 300 pages long and it wasn’t conclusively proven until the 20th century. | 
