我们其实永远不能看出一个人是不是在撒谎。所谓的“看出说谎”，不过是看出一个人是否紧张而已，而“紧张”和“说谎”根本是两码事。甚至所谓的“测谎仪”，也不过是在测“一个人是否紧张”而已。
你觉得测谎仪很科学，因为测谎的时候对面会先问一些平常的问题，了解被试者回答普通问题时的紧张程度？错！有关“有没有害人/有没有犯罪”的问题，是会让很多人比回答平常问题紧张很多的问题，无数无辜的人因为担心被诬陷而惊慌失措，结果被测谎仪认定为“罪犯”。
事实是，当警察使用测谎仪来辨别“罪犯”的时候，常常是为了“做实本来就带有很多偏见的猜测”。这也是为什么“测谎结果”通常不被法庭承认。 source
“To the extent it is used I fear it’s often for illicit finance. It’s an extremely inefficient way of conducting transactions, and the amount of energy that’s consumed in processing those transactions is staggering,” the former Fed chairwoman said. Yellen’s comments have been cited as a reason for bitcoin’s recent losses. However, Yellen’s assessment of bitcoin as a inefficient medium of exchange is an important point and one that has already been raised in the past by bitcoin bulls. Using a volatile asset in exchange for goods and services makes little sense if the asset can tumble 10% in a day, or surge 80% over the course of a two months as bitcoin has done in 2021, critics argue. To put a finer point on it, over the past 12 months bitcoin has registered 8 corrections, defined as a decline from a recent peak of at least 10% but not more than 20%, and two bear markets, which are defined as falls of 20% or more, according to Dow Jones Market Data.
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