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become victims of the violence they were covering there on the ground in syria. just hours before her death, american-born journalist marie colvin told anderson cooper just last night, quote, the syrian army is shelling the city of cold, stavrving civilians, end quote. colvin and remi ochik were killed in the shelling there. he was just 28 years old. he was a veteran war correspondent with the "new york times" for more than two decades. i have cnn's ivan watson and jim clancy joining me. ivan, i want to begin with you in istanbul. i'll get to you, jim, i know you definitely knew mari...

>> like someone responds right away, yeah, they responded. if they respond two to three hours later, what's going on? >> reporter: sounds addictive? could be. the instant gratification of getting a text back floods the brain with dope amean. >> those kids that are texting have the area light up the same as an addict using heroin. they describe when i don't have it, i feel bad or anxious or sad. >> reporter: like the new nicotine? >> that's a good description, yeah, for many it may well be. >> reporter: this brain doctor treats teens with sleeping disorders and discovered one out of five them a...