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Is going to be my big splurge. >> reporter: facebook announced it will make 25% more shares available than was initially believed. if they get the $38 a share they are hoping for, the company would be valued at $104.2 billion. still, gm's announcement raises doubts because the ipo price is, based among other things, on its potential to draw future advertising. >> advertising, of course, is just one way, but certainly a big way, that the company can potentially make money. and as it tries to become a public company and sell shares to investors, you know, what do investors want to see? they want...

This morning on "world news now" -- courtroom drama. john edwards' defense attorneys bring an abrupt end to their case by calling no star witnesses. >> setting the stage for today's big closing arguments in the former presidential candidate's conspiracy trial. it's thursday, may 17th. >> announcer: from abc news, this is "world news now." >> happy friday eve, everybody. i'm rob nelson. >> and i'm diana perez. paula faris is on assignment. we'll get to the legal drama in the john edwards case in just a moment. and then, we're going to take you to suburban atlanta where students and parents ar...

Instruct the jury that the prosecution does not have to prove that attempting to protect his campaign was the only reason for the cover-up. just that it was more than a side benefit. that jury, nine men and seven women from central north carolina which includes the town where edwards grew up. they are solidly middle class. >> the government always wants people who are sort of -- people that follow the law. >> reporter: the jury is racially balanced. six african-americans, possibly a strategy by the defense. >> defense went out of their way to talk about john edwards' strong commitment to pover...

♪ if i could talk to the animals ♪ ♪ just imagine it chatting with a chimp and chimpanzee ♪ ♪ imagine talking to a tiger, chatting with a cheetah what a neat achievement it would be ♪ this is my favorite story. >> you are very excited. this is all you. go ahead. this is made for you. >> yes. it's a story that's got all of us howling here in the newsroom. it's a scientific breakthrough that we can finally read the minds of dogs. >> now this raises -- >> he has to read this but he really doesn't want to. >> this raises the possibility that we only have just begun to communicate wit...

>> it proves that they've transferred the meaning of these hand signals to something that's behaviorally important to them. it's really getting at the start of how the dog processes dog/human communication. >> reporter: take a look again at this amazing million-dollar performance and look closely for the hand signals. hands outstretched, fingers up. an intricate conversation. i always wonder what my dogs are thinking when i call them and they come. do they recognize my voice and do they love me as much as i think they do? burns says the answer is yes. his newest brain scan shows callie has the...