초기 증세 없는 황반변성… 50대 이후 눈 검진 필수[베스트 닥터의 베스트 건강법] - 동아일보



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Physicists think they may know the key to unlocking time travel - BGR
Meet The Singing Mice That ‘Sing’ Like Birds And Have Competitive Duets - Forbes

Newly discovered amber reveals Antarctica once looked very different - NBC Montana
Study: Chinese Rover Finds Evidence of Ancient Ocean on Mars - VOA Learning English