we'll dig deeper into what they've been arguing about today. a defense computer re-enactment of the zimmerman-martin struggle. we'll show you next and show you the technology that went into it. we'll be right back. how'd you do on your quiz today? 9 out of 10. 9 out of ten? that's great. ♪ nothing says, "i'm happy to see you too," like a milk-bone biscuit. ♪ say it with milk-bone.