This book introduces knowledge about various aspects of life, including the Milky Way, the solar system, history, inventions, population, energy, and food. Imagine if the Milky Way were only the size of a plate, and the Earth only the size of a baseball; if the past 3000 years of history were condensed into one month; if all of humanity's inventions and discoveries were displayed on a 100-centimeter-long measuring tape; if the Earth's surface area were only the size of two pages of this book; if all the water on Earth were contained in 100 cups; if Earth, with its 7 billion inhabitants, were reduced to a village of only 100 people. When we scale down seemingly indescribable concepts and things to a familiar scale, these things become surprisingly simple.
本书介绍银河系、太阳系、历史、发明、人口、能源、食物等各方面的知识。如果银河系只有盘子那么大，地球只有棒球那么小；如果把过去3000年的历史浓缩进1个月；如果人类所有的发明、发现在一条100厘米长的卷尺上展现；如果地球的表面积只有本书的两页纸这样大；如果把地球上所有的水装进100个杯子里；如果有70亿人口的地球变成一个只有100人的村庄。当我们把看似没法描述的概念、事物，按比例缩减成我们熟悉的样子时，这些事情竟然简单得出人意料。
本书介绍银河系、太阳系、历史、发明、人口、能源、食物等各方面的知识。如果银河系只有盘子那么大，地球只有棒球那么小；如果把过去3000年的历史浓缩进1个月；如果人类所有的发明、发现在一条100厘米长的卷尺上展现；如果地球的表面积只有本书的两页纸这样大；如果把地球上所有的水装进100个杯子里；如果有70亿人口的地球变成一个只有100人的村庄。当我们把看似没法描述的概念、事物，按比例缩减成我们熟悉的样子时，这些事情竟然简单得出人意料。
