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THE MERCHANT OF DEATH - The Drug Enforcement Administration agents who caught the alleged arms dealer Viktor Bout explain how they lured and then captured the suspect one of them calls "one of the most dangerous men on the face of the Earth." Armen Keteyian reports. Robert Anderson and Pat Milton are the producers. DESIGNING LIFE - Steve Kroft profiles famous microbiologist J . Craig Venter, whose scientists have already mapped the human genome and created what he calls "the first synthetic species." Andy Court is the producer. MARK WAHLBERG - From street thug, to rapper to actor and now producer, Mark Wahlberg has reinvented himself to the top of the Hollywood heap. Lara Logan profiles Wahlberg as he prepares for his most challenging role: a boxer. Draggan Mihailovich is the producer.