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对人类种群起源和分布的研究曾是基于考古和化石证据。
Study of the origins and distribution of human populations used to be based on archaeological and fossil evidence.
谁不想加入名为“松鼠计划”(为松鼠观测募捐)或者“寻找丢失的瓢虫”(了解瓢虫种群的分布)的行动呢？
Who wouldn't want to join a mission called "Project squirrel" - inviting you to contribute squirrel observations, or "The Lost ladybug Project" - to understand ladybug species distribution.
研究人员发现了大约1000个种群，而且从个体到个体间分布一致；原来人们的鼻子里、背上都住的房客都大同小异。
The researchers found about 1000 species total, which were fairly consistent from person to person; it turns out we all have similar tenants in our noses and on our backs.
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