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Shuji KajiyamaAPNintendo has warned that the 3-D screen on its new 3DS handheld game device shouldn’t be used by children 6 or younger because it may harm their immature vision.The British newspaper the Sun splashed a report across its front page on Tuesday saying that the Nintendo 3DS is being returned at record rates in the United Kingdom. There have been reports that the handheld is causing some headaches and dizziness since Nintendo launched the 3DS, but this is the first mention of widespread returns.