Acoustic Black Hole Created
One of the many curious properties of Bose-Einstein Condensates (BECs) is that the flow of sound through them is governed by the same equations that describe how light is bent by a gravitational field. That sets up the possibility of all kinds of fun and games: in theory, physicists can reproduce with sound and BECs whatever wicked way gravity has with light. Ori Lahav at the Israel Institute of Technology, in Haifa, say that they've created the sonic equivalent of a black hole. 我们西店王家一个是8千多万，西店本村一个是6千多万，团船一个是1亿3千多万，这3个人加起来就有3亿了，难道宁海的非法集资才3亿，还不如一个西店，再说了，西店上百万的有好几十个，西店算算也有5...6亿类
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