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How did Chazal know they were right about “who is a Jew”?

My question is predicated on the assumption that Jews were created by God as fundamentally different from non-Jews. (I am referring, for example, to the idea that Jews have a special type of soul. And ...
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Is the brain the seat of the soul?

There are disturbing ideas in the Feb 21, 2011 Time magazine cover article 2045: The Year Man Becomes Immortal. The article attributes to Raymond Kurzweil the prediction that within the next 25 years ...