DAR-1 is one of the many social robots with facial recognition abilities on display for the robot petting zoo at the South by Southwest interactive festival. Jack Plunkett/AP hide caption

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Bystanders rush to help those who were struck by a vehicle early Thursday on Red River Street in Austin, which was crowded with people headed to South by Southwest events. Jay Janner/Austin American-Statesman/MCT/Landov hide caption

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Bystanders rushed to help those who were struck by a vehicle early Thursday on Red River Street in Austin, which was crowded with people headed to South by Southwest events. Jay Janner/Austin American-Statesman/MCT/Landov hide caption

toggle caption Jay Janner/Austin American-Statesman/MCT/Landov

A set of littleBits comes with more than 40 different types of electronic pieces that connect with magnets. NPR hide caption

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Screenshot from Apple's "Photos Every Day" iPhone 5 ad picturing a scene from the Yeah Yeah Yeahs performing at NPR Music's SXSW 2013 Stubbs Showcase. Screenshot via apple.com hide caption

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Festival attendees experiment with Leap Motion technology. Elise Hu/NPR hide caption

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