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updated: 4/24/2013 9:42 AM

Did brotherly bond play role in Boston bombings?

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Associated Press

It's a vexing puzzle about the boston marathon bombings: the younger of the two accused brothers hardly seemed headed for a monumental act of violence. how could he team up with his older brother to do this? nobody knows for sure, but some experts in sibling research say the powerful bonds that can develop between brothers may have played a role.

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