Peering at bright screens after dark could harm health, doctor claims

Light from TVs, computers, tablets and smartphones may disrupt sleep and raise risk of obesity, heart disease and depression

From the archive, 22 May 1993: British computer hackers behind bars

Originally published in the Guardian on 22 May 1993: Two hackers become the first offenders to receive jail sentences under the 1990 Computer Misuse Act

Xbox One: Microsoft reveals new console that ‘changes everything’

First major revamp of Xbox since 2005 integrates TV, internet and gaming in what Microsoft describes as 'rocket-science stuff'

Apple chief calls on US government to slash US corporate tax

Tim Cook warns Congress that he would refuse to repatriate $100bn stashed offshore unless US severely reduced its 35% tax rate

Critics of big data have overlooked the speed factor

Velocity, not volume is increasingly what determines the hardware and software needs of data-processing organisations

Apple joins BlackBerry and Samsung in getting Pentagon approval

iPhone and iPad to battle for contracts worth millions of dollars, boosting their standing in corporate and government markets. By Charles Arthur

Web-connected libraries for Africa: the dream of digital knowledge for all

New venture Librii is seeking to set up self-sustaining libraries with internet access in poor and isolated communities, writes James Bridle

Is computing speed set to make a quantum leap?

Quantum mechanics research could hold the key to a new generation of super-fast computers, writes John Naughton

Can a Windows 8 hybrid PC replace a desktop, a laptop and a tablet?

Jack Schofield: Leon works from home, travels a lot and wants versatile hardware that also allows access to tablet apps such as Evernote

Apple sells 50 billionth app

From Angry Birds to Summly, smartphones and tablets have accelerated a huge business that began just five years ago

Apple chief Tim Cook charity auction stands at over $600,000

Anonymous bidder stands to pay around $20,000 a minute for half hour meeting with tech giant's chief executive. By Charles Arthur

20 ways to keep your internet identity safe from hackers

Cybercrime costs Britain £27bn a year, and it could cost you dear too if you don't take basic precautions. James Silver asked experts for their top tips

Huawei boss says US business block on telecoms equipment group will backfire

Ren Zhengfei breaks silence over government's refusal to do business with Chinese group on cyber-security grounds. By Anthony Doesburg

Editing web pages in Windows 7 and accessing old websites with IE10

Ask Jack: Chris has upgraded to Windows 7 and complains that he can no longer edit HTML files in Notepad, while Steve has upgraded to Internet Explorer 10, and his wife can no longer access the old NHS site she needs for her job…