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creating search as we know it. she was one of googles first employees. first female engineers, and also responsible for the look and feel of the popular search engine that we use every day. oh and let me add two more impressive stats. marissa marissa mayer i 37 and about to be a mom for the first time. >> i wonder whats going to be harder, yahoo! ceo or first-time mom. >> you tell me. im not a ceo or mom. youre a mom. i nt know. i think having a baby and running a company and trying to...

attack by government forces on the besieged city. one of the single most horrifying moments in syria occurred late last month. scores of people died in a town called douma as a result of government shelling. nearly three weeks later, we have our hands on video documenting this tragedy. shes live with us. take us back to what happened in douma on june 29th. >> reporter: the reason why its taken three weeks to get our hands on that video is because the activists that wanted to shoot it...

we begin with both presidential campaigns getting down and dirty on the low road as the candidates themselves try to stick to the high road. the latest examples, killer tv ad that the obama campaign is using to welcome so-called welcome mitt romney to pennsylvania. and a top romneys surrogates complaint that the president should "learn how to be an american." lets go to our white house correspondent, dan lothian, watching all of this unfold. weve been saying its getting ugly. >> report...