Human-alien hybrids fill science fiction stories, and the most famous of these is Mr. Spock from Star Trek — the logical science officer of the starship Enterprise. Seeing such real-life beings born from alien and human parents in the future, however, remains unlikely — but not impossible. The time is approaching where our species will begin colonizing other planets and, perhaps, even finding intelligent life on distant worlds. Does this mean that it will be possible to live in a world in which humans and aliens live in harmony, fall in love, and have children, as we see in science…

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