Science and technology

Associated Press
Microsoft corporate vice president for Windows Julie Larson-Green holds up a Acer Iconia W3 tablet while speaking at a Microsoft event in San Francisco, Wednesday, June 26, 2013. Microsoft is using a three-day conference this week to give people a peek into Windows 8.1, a free update that promises to address some of the gripes people have with the latest version of the company's flagship operating system. A preview version of Windows 8.1 was released Wednesday at the start of the Build conference for Microsoft partners and other technology developers. (AP Photo/Jeff Chiu)

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