地球上的病毒，比宇宙里恒星的数量还要多。以下文章来源于原理，作者原原。科学，照亮黑暗的蜡烛。创作团队：选题：HZXZ；文字：Takeko；封面及文首图设计：雯雯子；长图设计：Takeko。
参考来源：https://www.bbvaopenmind.com/en/science/research/the-origin-of-viruses-a-puzzle-that-will-help-us-to-understand-evolution/；https://www.sciencedaily.com/releases/2021/02/210218142739.htm；https://www.nationalgeographic.com/science/article/factors-allow-viruses-infect-humans-coronavirus；https://www.statista.com/statistics/1095129/worldwide-fatality-rate-of-major-virus-outbreaks-in-the-last-50-years/；https://www.nature.com/articles/nrmicro2644；https://static1.squarespace.com/static/581a4a856b8f5bc98311fb03/t/5ada612470a6ad672eea01b3/1524261157638/GVP%2B2%2Bpager%2BFINAL.pdf；https://jb.asm.org/content/202/9/e00052-20；https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3427559/；https://phys.org/news/2014-03-ancient-virus-dna-remnants-pluripotency.html。
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