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College students and recent graduates crammed the top floor of a tech hub in Nairobi for a competition built around the theme "Solutions for the Next Billion Mobile Users." Africa has more than 600 million mobile phone users (approximately 11 percent of the global total) – and the number is growing.

A computer-simulated woman named Ellie is designed to talk to people who are struggling emotionally and take their measure — 30 times per second. Researchers hope their technology, which reads a person's body language and inflections, will yield diagnostic clues for clinical therapists.

Inspired by a TED talk, Winston Chen quit his software job and moved from Boston to a tiny Norwegian island with his wife and kids. He spent the year enjoying the outdoors with his family and writing an iPhone app, something he would never have done without his self-imposed sabbatical.

Yahoo is expected to announce Monday that it's acquiring the social media site Tumblr, in a deal The Wall Street Journal and other news outlets are reporting to be worth about $1.1 billion. Some analysts are calling the acquisition an effort by Yahoo to be "cool and relevant" again.

Microsoft has had few blockbuster successes in recent years. On Tuesday, when the tech giant is scheduled to introduce its new Xbox, it will be targeting more than just hard-core gamers. Analysts say Microsoft will also be aiming to make its console the center of entertainment in your living room.

Most health plans accept a credit card for the first month's premium and then require customers to pay monthly with a check or an electronic transfer from a bank account. For people without a banking relationship, these transactions can be tricky.

What do you do when you can't openly wage a campaign for the presidency? Some Iranians inside and outside the country have turned to the heroine of an online graphic novel who has embarked on a virtual campaign.

There is one place in the country where a law enforcement agency can trace a gun found at a crime scene back to a buyer: the ATF's National Tracing Center in West Virginia. But the tracing process is usually tedious, involving multiple phone calls and searching, by hand, through paper records.

The state straddles Tornado Alley and has had a number of especially strong twisters leave a path of death and destruction in their wake.

Twitter captures firsthand accounts and reaction from the massive tornado that swept through central Oklahoma.