really? and maybe a bunch of billionaires as well. what many people are asking is to buy or not to buy? that is the question today. ali velshi and christine romans have very, very different opinions on whether you should buy in or not. i m curious. do you buy? i m on facebook. love facebook. is this going to be apple or not? remember, apple went sideways for a long time and almost went out of business first, right? it s more like google maybe. google went up. both were game changers. that s right. this is going to be history one way or the other. the way i see it, this is the second transformation of the internet. the reason i say that, remember, brooke you re probably too young to remember. when we used to get all those disks for aol, they would mail them to you. you get them at the supermarket and you get this portal? the internet was about portals where you got weather, traffic, business, sports, all these things you didn t know where to get anywhere else. google
reporter: for the last ten years, 41-year-old construction worker mark jakoby had no idea why his body was failing. when you started to have symptoms and lose different types of muscle control, you kept using fixodent? yes. because i had no clue. reporter: doctors eventually tied his disorder to high levels of the mineral zinc. high zinc intake can lead to the depletion of copper levels in the body which can cause nerve damage. so, where did he get all the zinc? jakoby says it was his denture cream, fixodent, which contains zinc. fixodent and forget it, guaranteed. gets soaked in your body. and it messes with the nerves. reporter: a study in 2006 of four ptiensfirmadehe -waknebut years, according to its authors, because of a peer review by dr. kenneth shay which said the authors don t understand the nature of the material they re writing about. but abc news has learned dr. shay failed to disclose a conflict of interest, that he was also a paid consultant for procter & gambl
reporter: for the last ten years, 41-year-old construction worker mark jakoby had no idea why his body was failing. when you started to have symptoms and lose different types of muscle control, you kept using fixodent? yes. because i had no clue. reporter: doctors eventually tied his disorder to high levels of the mineral zinc. high zinc intake can lead to the depletion of copper levels in the body which can cause nerve damage. so, where did he get all the zinc? jakoby says it was his denture cream, fixodent, which contains zinc. fixodent and forget it, guaranteed. gets soaked in your body. and it messes with the nerves. reporter: a study in 2006 of four patients first made the possible link between heavy use of denture cream containing zinc and neurological problems. including numbness and muscle weakness. but publication of that study was delayed for more than two years, according to its authors, because of a peer review by