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- [Narrator] There's a creature scurrying
- [旁白]有一個生物亂竄。
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across your face right now. Yes, you,
在你的臉上，現在。是的，你。
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and at some point, maybe now, maybe in a few days,
而在某些時候，也許是現在，也許是幾天後。
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it's going to find a nice cozy pore in your skin
它將在你的皮膚上找到一個舒適的毛孔
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and lay a single enormous egg.
併產下一個巨大的雞蛋。
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Meet the face mites. They're smaller than a grain
見識一下面蟎。它們比一粒糧食還小
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of sand, are a kind of arachnid like spiders,
的沙子，是一種像蜘蛛一樣的蛛形動物。
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and they feast on the oil and cells in your skin,
它們以你皮膚中的油脂和細胞為食。
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particularly on your oily nose, cheeks, and forehead.
特別是在你的油性鼻子、臉頰和額頭上。
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Scientists suspect they've been living on us
科學家懷疑它們一直生活在我們身上。
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since the dawn of humanity over 200,000 years ago,
自20多萬年前人類誕生以來。
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and today, studies suggest practically every adult
今天，研究表明，幾乎每個成年人
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on the planet has thousands of them.
在這個星球上有成千上萬的人。
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Odds are you've been living with them your whole life.
估計你這輩子都和他們生活在一起了。
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Babies quickly get them from their parents
嬰兒很快就會從父母那裡得到它們
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a few days after birth, and once those face mites
出生後幾天，一旦這些面蟎
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are on you, the only thing they enjoy as much
在你身上，唯一的事情，他們享受一樣多
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as slurping oil and nutrients from your pores is
因為從毛孔中吸取油脂和養分的方法是
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having sex all over your face.
在你臉上做愛。
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Afterwards, females burrow deep
之後，雌性就深埋於地下
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into your pores where they lay their eggs.
進入你的毛孔，它們在那裡產卵。
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The eggs end up in one of two places
雞蛋最終會落入兩個地方之一
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depending on the species of face mite.
根據面蟎的種類不同。
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The first species, called Demodex folliculorum,
第一個種，叫Demodex folliculorum。
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lays its eggs in your hair follicle,
在你的毛囊中產卵。
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while the second prefers nesting in your sebaceous glands.
而第二種則更喜歡在你的皮脂腺裡築巢。
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And in under two weeks, the babies hatch,
不到兩週，寶寶就孵化出來了。
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mate, lay their own eggs and die,
交配，自己產卵，然後死亡。
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leaving behind a pile of decomposing corpses.
留下一堆腐爛的屍體。
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Now, you can wash some of this off,
現在，你可以洗掉一些這個。
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but you'll never eradicate them completely
但你永遠也無法完全消除它們。
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because even if you treat them with antibiotics,
因為即使你用抗生素治療他們。
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they'll return in about six weeks, tops.
他們會在大約六週內返回，最多。
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You'll pick them up from towels, pillows,
你會從毛巾、枕頭上撿到它們。
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and your loved ones.
和你的親人。
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Well, that all sounds horrific,
嗯，這一切聽起來很可怕。
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but usually face mites are harmless.
但通常面蟎是無害的。
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They only become a problem when they multiply
只有當它們繁殖的時候才會成為問題
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out of control. This can happen in people
失控。這可能發生在人身上
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with an impaired immune system.
免疫系統受損的情況下。
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It's also been seen in people with a painful skin
也有的人出現了皮膚疼痛的情況。
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condition called rosacea.
稱為酒糟鼻的情況。
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Normally, you'll have around one or two mites
一般來說，你會有一兩隻蟎蟲。
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per square centimeter of skin,
每平方釐米的皮膚。
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but one study found that people with rosacea
但一項研究發現，有酒渣鼻的人。
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had 10 times the normal amount.
了正常數量的10倍。
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Believe it or not, in some cases,
不管你信不信，在某些情況下。
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face mites can be useful.
臉上的蟎蟲可以有用。
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Researchers can actually study your face mites
研究人員其實可以研究你的面部蟎蟲
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to learn about your ancestors.
來了解你的祖先。
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You see, most mites often stay within a community.
你看，大多數蟎蟲經常呆在一個社區內。
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So over time, they've evolved into distinct lineages
所以隨著時間的推移，它們已經進化成了不同的血統。
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in different geographic regions, and by comparing
在不同的地理區域，並通過比較。
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their DNA, scientists can trace how different groups
科學家們可以追蹤不同群體的DNA
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of humans migrated across the world.
的人類遷徙到世界各地。
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For example, a study found that European mites
例如，一項研究發現，歐洲蟎蟲。
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genetically diverged from East Asian mites
蟎類
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around 40,000 years ago.
大約在4萬年前。
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That's the same time European and East Asian humans
那是歐洲人和東亞人的同一時間。
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parted ways. Pretty handy.
分道揚鑣了。很方便。
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So when it comes down to bugs crawling all over you,
所以當你身上爬滿蟲子的時候。
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it could be a lot worse.
這可能是一個更糟糕的。
