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1062. Talent and Virtue (25) About 900 years ago, a Chinese philosopher Sima Guang wrote a history book in which he talked about people's talent and v 阅读全文
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1100. Mars Numbers (20) People on Mars count their numbers with base 13: Zero on Earth is called "tret" on Mars. The numbers 1 to 12 on Earch is calle 阅读全文
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1073. Scientific Notation (20) Scientific notation is the way that scientists easily handle very large numbers or very small numbers. The notation mat 阅读全文
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1070. Mooncake (25) Mooncake is a Chinese bakery product traditionally eaten during the Mid-Autumn Festival. Many types of fillings and crusts can be 阅读全文
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1069. The Black Hole of Numbers (20) For any 4-digit integer except the ones with all the digits being the same, if we sort the digits in non-increasi 阅读全文
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1058. A+B in Hogwarts (20) If you are a fan of Harry Potter, you would know the world of magic has its own currency system -- as Hagrid explained it t 阅读全文