Grief leads father to create bomb-defusing robot

(AP) -- The knock on Brian Hart's door came at 6 a.m. An Army colonel, a priest and a police officer had come to tell Hart and his wife that their 20-year-old son had been killed when his military vehicle was ambushed in Iraq.

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<p><a href="http://www.physorg.com/news134531612.html">Grief leads father to create bomb-defusing robot</a></p> <p>(AP) -- The knock on Brian Hart's door came at 6 a.m. An Army colonel, a priest and a police officer had come to tell Hart and his wife that their 20-year-old son had been killed when his military vehicle was ambushed in Iraq.</p>