It odesn't matter what it rings the needle at on the bs meter. All children respond alike. And out of the mouths of babes, sometimes comes wisdom. This is one of those times.
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And if the child in question had been described as 3 or 4 or maybe even 5 years old, the story might be believable (except that the follow-on analysis described as having occurred on the spot would require an unusually precocious preschooler). I don't believe for a second that a non-retarded 9 year old from any literate family has never heard the word "abortion" and has no idea what it means. This country is awash in abortion debate; there are abortion bumper stickers (pro and con) galore, kids at school go to various churches many of which make a big deal about abortion, kids at school have parents who participate in pro and anti abortion demonstrations and organizations (many of which are visible to passengers in passing vehicles). This story is about as believable as Mary Mapes' perennial insistence that the Rathergate memo was authentic.