CNN Anderson Cooper 360 April 23, 2013 08:30:00
Our hearts are sickened by the knowledge of the horror he has inflicted. >> as you can see, there are lots of different perspectives. the problem is finding out who the real tsarnaev brothers are. >> the one thing that they do know is that they made pressure cooker bombs. our david mack ka any went to the desert research center to recreate the bombs used in terrorist attacks. >> reporter: at this remote testing ground experts from new mexico tech replicate bombs. on this day there's a sense of urgency. >> reporter: after boston, what are you worried about? >> you're always worried about copy c...
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