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The scenario getting play in the blog world is the "burning building" scenario: you're in a room of a burning building with a 2-year-old toddler and a container which holds 5 human blastulas. You can only carry one of them. Which one do you save? (Since I know grexers are too lazy to use google, I'll mention that a blastula is an early stage of embryonic development which has on the order of 128 undifferentiated cells.)
You have several choices: