Best Video/なぜ夜は暗い？「Why is it Dark at Night?」

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 * blog=Best Video
 * module=Article
 * author=Gaijin
 * publishingtimestamp=2012/10/16 21:00
 * title=なぜ夜は暗い？「Why is it Dark at Night?」
 * categories=科学
 * leading=なぜ夜は暗い？
 * text={{ Widget YouTube Advanced | id = gxJ4M7tyLRE | width = 560 | height = 315 | language = ja_JP }}

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アメーバブログ - BEST VIDEO - ベストビデオ }}
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