"I think the more rational explanation is that the excision of a five-to-six-foot leech from the surface of a human body means that that body is going to have more of its own blood in its own veins. Unless the leech finds another body, it is going to go hungry."

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Art, if it is successful, needs no explanation. Star Trek and Spock, if they are works of art, can be discussed. But finally the response comes in individual terms. Each viewer sees what is there for him, depending on his frame of reference.

— Leonard Nimoy