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The front page of The Sacramento Bee newspaper on Oct. 15, 1999 contained an article that began as follows:

The front page of The Sacramento Bee newspaper on Oct. 15, 1999 contained an article that began as follows:

In a new challenge to the long-standing belief that adults never generate new brain cells, biologists at Princeton University have found that thousands of freshly born neurons arrive each day in the cerebral cortex, the outer rind of the brain where higher intellectual functions and personality are centered. Though based on research in monkeys, the finding is likely to prove true of people, too.

What justification is there for saying it's likely? After all, people aren't monkeys.


Although people are not monkeys, nevertheless monkeys are people.


People really are monkeys, though gorillas are not.


Humans and monkeys are both four-limbed creatures with two eyes and a curious nature.


Monkeys and humans have biologically similar brains.

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