Steve Kroft talks with Director of Homeland Security Richard Stana on the status of the multi-billion-dollar "virtual fence" being built at the U.S.-Mexican border.
Anderson Cooper's report looks at behind-the-scenes issues from the Republican and Democratic camps during the 2008 presidential campaign.
Lesley Stahl reports on advances in sustaining endangered species and maybe day even resurrect some that have died out by using DNA technology.
S 44 : Ep 35
Aired 5/20/12
S 44 : Ep 34
Aired 5/13/12
S 44 : Ep 33
Aired 5/6/12 (42:59)
S 44 : Ep 32
Aired 4/29/12
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