Hi, I thought you may like this Mentalrobics exercise from Braingle.com:
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Fatherhood Increases Intelligence

A study from Princeton University has found that monkeys who become fathers may get enhanced brains. Enhancements included an increase in the number of connections between neurons [ For more on 'neurons' go here: http://www.braingle.com/mind/317.html ], and an increased sensitivity to the hormone vasopressin, which is implicated in memory formation. These changes are located in the prefrontal cortex [ For more on 'prefrontal cortex' go here: http://www.braingle.com/mind/329.html ], which is an area of the brain that is important for memory and decision making.

Unfortunately, as the infant ages, the father's enhancements gradually decrease to normal. It is unknown if human fathers experience the same mental boost.
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For more mind exercises: http://www.braingle.com/mind/