Anderson Cooper interviews undercover informant Michael Blutrich, one of the most effective informants ever, according to authorities; then, with over 50 percent of our nation lying underwater, huge discoveries await, says explorer Robert Ballard; and, Sharyn Alfonsi profiles Greg Glassman, creator of the CrossFit workout.
Desperation fuels the largest mass migration since WWII in which thousands have died trying to reach Europe by sea; then, David Martin gives a rare look at how a branch of the U.S. Air Force called Space Command is preparing for a battle most of us have never thought about -- one high above the Earth.
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