In Pictures: Google's most innovative projects

Google unveiled two new products at its I/O developer conference: the Nexus 7 tablet and Project Glass. Here's a look at how some of Google's other famous projects got their start.

5. Android, 2007

In 2005, Google acquired Android, Inc., a little-known company that operated secretly and disclosed only that it was working on software for mobile phones. Two years later, at the first Open Handset Alliance consortium, Android was unveiled as a mobile device platform built on the Linux kernel version 2.6.

Several years later, Android is one of the leading mobile platforms.

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