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WikiPedia: Cuộc_sống_bóng_tối http://news.bbc.co.uk/1/hi/sci/tech/7893414.stm?ls... https://www.newscientist.com/blogs/shortsharpscien... https://www.sciencedaily.com/releases/2009/02/0902... https://web.archive.org/web/20171219152033/https:/...