The second decade of the 21st century is coming to a close, and there's a lot to look back on. The Rosetta spacecraft made the first successful landing on a comet, the United States had two presidents, a whole lot of Marvel movies came out, and we got the first close-up photos of Pluto.
The 2010s also saw the rise of the smartphone as a product category. While there were plenty of smartphones in the 2000s, they didn't become widespread consumer-level devices until the introduction of the iPhone in 2008 and subsequent release of the first Android devices in 2009.
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