No one at any level of the federal workforce should be guaranteed a lifetime position.

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At the same time, the fertility rate (the number of children an average woman will have in a lifetime) is now 1.39, well below the replacement level.

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With a lifetime rating of 82.3 percent, McCain would rate "on the lower level of what we would consider to be conservative, " Keene tells Steve Inskeep.

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The EPA maximum contaminant level is 3.0, but this is a conservative standard designed to minimize exposure over a lifetime, so EPA does not consider these levels to pose a health threat.

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