6-3=？这个简单的算式，答案似乎显而易见是3。然而，伟大科学家爱因斯坦却曾写下了一个令人费解的等式：6-3=6。这究竟是怎么回事呢？

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On one level, sudoku is a simple and fun way to pass the time and keep the brain ticking – but dig deeper, and some ...

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Hello, Yahoo Life readers! My name is Kaitlin, here to bring you the health and wellness tips you need to know this week. Before you step outside, check out the weather in your area, and if you ...