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Scientists who last year found particles that appeared to break the Universe's speed limit are looking at two technical issues that could have skewed the controversial finding, CERN said Thursday.

(PhysOrg.com) -- Although human vision is capable of perceiving objects in three dimensions (3D), we spend much of our day looking at two-dimensional screens. The latest televisions and monitors can trick us into perceiving depth, by presenting different images to our left and right eyes, but they require special-purpose glasses, or specialized large-area lenses applied directly to the screen.