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I thought you might be interested in looking at Sự “cong” Của Vận Tốc ánh Sáng.
http://diendan.lyhoclacviet.vn/chu-de/13944-s%E1%BB%B1-%E2%80%9Ccong%E2%80%9D-c%E1%BB%A7a-v%E1%BA%ADn-t%E1%BB%91c-%C3%A1nh-s%C3%A1ng/?do=findComment&comment=78259
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