Read MoreSeveral killed as tornadoes rip through Oklahoma; California restaurant uses robot to deliver food, clear dishesSeveral killed as tornadoes rip through Oklahoma; California restaurant uses robot to deliver food, clear dishes
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Read MoreSeveral killed as tornadoes rip through Oklahoma; California restaurant uses robot to deliver food, clear dishesSeveral killed as tornadoes rip through Oklahoma; California restaurant uses robot to deliver food, clear dishes