Do elementary-school students really need laptops?
No, they don't. Computer have no positive effect on child brains, which develops using interactions with its environment. TVs and computers are a real threat to childs consciousness and intelligence. BTW, you may ask some Silicon Valley's gurus why they put their childs in technology free schools : http://www.nytimes.com/2011/10/23/technology/at-waldorf-school-in-silicon-valley-technology-can-wait.html
Often statistics are used as a drunken man uses lampposts -- for support rather than illumination.