June 17, 2009 8:28 am Gravity Hill What goes up must not always come down? Rumors have it that there exists a “Gravity Hill’ in Washington state where cars roll uphill. US & World Videos 0:59 Runaway zebras corralled in Washington state; one still missing 1:40 Charlie Puth reacts to Taylor Swift's ‘The Tortured Poets Department' name-drop 2:52 Severe weather kills at least 5 as tornadoes rip through Midwest and South 0:48 World Central Kitchen to resume operations in Gaza 0:23 Names of two pandas coming to San Diego revealed