Marijuana plants grow at a farm near Medellin. Tony Dokoupil's father made hundreds of thousands of dollars smuggling marijuana into the U.S. from Colombia. Raul Arboleda/AFP/Getty Images hide caption

itoggle caption Raul Arboleda/AFP/Getty Images

Cesar Millan's television show Dog Whisperer on National Geographic debuted in 2004, but Millan previously spent years struggling to pursue a career as a dog trainer. Robin Layton/Courtesy of Cesar Millan hide caption

itoggle caption Robin Layton/Courtesy of Cesar Millan