A firm handshake, we’re told, is essential for making a good first impression.

Fair warning though – shake too hard, and you might have a fight on your hands.

Just ask Jim Harbaugh, the rookie coach of the San Francisco 49ers. After a heated,  back-and-forth game between his team and the 2011 NFL season’s other fairy tale franchise, the Detroit Lions, Harbaugh jumped and ran and yelled his way across the field, lifting his shirt, ...

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