Robert E. Wells Kolejność książek (chronologicznie)

如果没有钟表和历法,我们的生活会变成什么样子?你知道早上几点起床吗?你知道足球赛什么时候开始吗? 很久以前,人们观察太阳和月亮,通过记录它们的运行轨迹来估算时间。随着时间的推移,人们找到了更多测算时间的方法,无论在何时何地,原子钟都能告诉我们精确的时间。

A pygmy shrew is small―it's among the littlest mammals! A ladybug is even smaller, but it hardly seems tiny when you compare it to a protozoa! And there are many things smaller still―so small that we can see them only with a microscope. Would you believe there are particles that are so tiny that we can't measure their exact size? Explore the huge world of the very small!