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The video, taken by time-lapse photographer Jonas Høholt, shows Greenland's icebergs transform over four months.

A Delta Force members takes us through the quest of finding the Unit's best shooter.

Investigators. it woulden clupd the mi einclud fbi, d.c. police force. among others. they all knead how to work together. certainly elt would be awful if they worked independently. lets talk about the challenges, in the investigation. joining us michael chertoff, served as secretary of homeland security, he is chairman of the chertoff group, a global security firm. and maryellen otoole, a former fbi special agent and senior pro timer. cnn law enforcement analyst, tomful. -- tom fuentes. michael ...