Peter Tyson works for the science magazine NOVA. He explains why there are so many kinds of dogs

彼得泰森在科学杂志NOVA工作。

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Dogs are trained to work with humans in many ways. But humans also breed dogs for something other than work. Peter Tyson of NOVA explains.

人们还训练狗做很多其他事情。但是并不是人们培育的所有的狗都是用来干活的。NOVA杂志彼得·泰森解释道。

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And here are the revelations from Peter Orszag, former OMB director, now a Citibank vice chairman, Laura Tyson, former Chair, Pres.

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