A handout picture made available by SpaceX shows a Falcon 9 rocket landing upright at Cape Canaveral Air Force Station in Florida. SpaceX successfully returned a rocket to Earth following Monday's satellite launch after two earlier attempts failed. SpaceX/EPA/Landov hide caption

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New autopilot features are demonstrated in a Tesla Model S during a Tesla event in Palo Alto, Calif., Wednesday. Beck Diefenbach/Reuters/Landov hide caption

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Self-Driving Cars Hit The Streets, Sort Of
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The SpaceX Falcon 9 rocket and Dragon spacecraft break apart shortly after liftoff from the Cape Canaveral Air Force Station in Cape Canaveral, Fla., on June 28. SpaceX CEO Elon Musk said Monday the failure of a steel strut likely caused the rocket to explode. John Raoux/AP hide caption

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Musk with the Tesla Model S in Fremont on Oct. 1, 2011. Stephen Lam/Reuters/Landov hide caption

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A rendering of a Hyperloop pod. Courtesy of Elon Musk hide caption

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A Closer Look At Elon Musk's Much-Hyped Hyperloop
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Elon Musk's "Hyperloop" vehicle. Elon Musk hide caption

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After Much Hype, Elon Musk Unveils His High-Speed 'Hyperloop'
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