Half-life, in radioactivity, the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay, or, equivalently, the time interval required for the number of disintegrations per second of a radioactive material to decrease
Overall, “The Half-Life of Facts” is an engaging book. It moves along at a nice pace, and I think Universe Today readers will find it very interesting. My only beef with the book is its title. It’s about much more than the half-life of facts. It’s a vivid ...
When I say that a fact has a half-life, I am trying to illustrate how knowledge changes by making an analogy to radioactivity. With radioactivity, if you give me a single atom of uranium, I can tell you it will eventually decay. When it does, it will break down into specific bits an...
Many medical schools tell their students that half of what they've been taught will be wrong within five years—the teachers just don't know which half. Arbesman, a Harvard University–affiliated practitioner of scientometrics—which looks at how we know what we know—sets out to make readers...
The Half-Life of Facts(《失实》) 中文版简介: 以前医生建议吸烟,现在又说吸烟致命;我们一度认为地球是宇宙的中心,认定冥王星是一颗行星,深信雷龙是一种真实存在的恐龙,但这些事实已经通通被推翻。可见,事实并非一成不变。 但是,知识的变...
The Half-life of Facts: Why Everything We Know Has an Expiration Date, (Sept. 2012), in which he investigates the frequency of changes in scientific... S Arbesman,BM Puri 被引量: 0发表: 2013年 John Cage: Zen Ox-Herding Pictures The Half-Life of Facts: why everything we know has ...
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在过去半个世纪里,上面列出的所有事实都被证明是错误的。根据Samuel Arbesman的新书《事实半衰期:为什么我们知道的一切都有一个过期时间》——在现代世界,事实时刻在改变。由于事实的创造和重新创造正在加速,Arbesman担心我们中的大多数人都不能跟上变化,这意味着我们作出的决策往往是基于学校和大学课堂里传授的可能错误...
kicking at the predators with front and back legs. Cows have food and water requirements that may keep them away from the nursery group for hours at a time, and about half of very young calves are killed by lions and hyenas. Calves sample vegetation at three weeks but suckle for 18–22...