It's been expected for months, but there's news this week that Chinese e-commerce giant Alibaba has chosen the United States for its initial public offering. Analysts say the company is worth some $140 billion. But what exactly is Alibaba, and why launch an IPO in the U.S.? Plus, you may have heard of Oculus Rift, the screen-capable goggles that promise to put you in the game like never before. But is virtual reality the future of gaming?