around 7 octillion to be exact.

準確來說，有七十億個原子。

These make up the 37 trillion cells in your body, which are actually much younger than you think.

這些原子組成了我們身體裡 37 兆個細胞，而且他們比你想的都還年輕許多。

The cells that lie in your stomach regenerate every 5 days,

像是在胃裡面的細胞，平均每五天就再生一次，

which makes sense as stomach acid can dissolve metal.

感覺很合理，因為胃酸都可以溶解金屬。

Your skin's outer layer, known as the epidermis, is shed every two to four weeks,

你的皮膚外層，也就是表皮，每2到4個禮拜就會脫落，

meaning after one year you'll shed roughly 0.7 kilograms of dead skin,

也就是說，你一年會脫去 0.7 公斤的死皮，

and only some cells have been with you your entire life,

只有某些細胞會一輩子陪著你，

those of the inner lens of the eye, the muscle cells of the heart and the neurons of the cerebral cortex in your brain which is largely responsible for your memory.

包括眼球細胞、心臟的肌肉細胞、還有大腦皮質層的神經細胞神經細胞，主要掌管你的記憶 。

And while the brain may seem small, all those wrinkles are for a good reason.

雖然大腦有點小，但它的皺摺不是沒有原因的。

Spread it all out, and the brain would be about the size of a pillowcase,

如果把大腦攤開，大小大概就會跟枕頭一樣大，

which is great for the trillion nerves powering your memory.

你的記憶就是靠上面數兆的神經元來運作。

In fact, studies have shown that after viewing 2,500 images for only 3 seconds,

事實上研究顯示，即使只花 3 秒快速掃過 2,500 張圖片，

participants could recall if they had seen one of the images with 92% accuracy.

受試者還是能夠以 92% 的準確度，指出他看過了哪些影像。

Don't believe your eyes? Maybe it's because you spend 10% of the day blinking,

你不相信你的眼睛嗎？可能是因為你一天之中有 10% 的時間都在眨眼，

but they can actually distinguish between 2.3 to 7.5 million colors.

但實際上，眼睛可以分辨230萬到750萬種顏色。

Your nose is able to discriminate between 1 trillion different smells,

你的鼻子則能夠嗅出一兆種不同的味道，

meanwhile your fingers can feel a ridge as small as 13 nanometers in size.

還有你的手指也能感覺到 13 奈米的突起。

That's 7500 times smaller than the diameter of a human hair.

13 奈米相當是一根人類頭髮直徑的7500分之1。

And while you may not think much of your pinky finger, without it, you'd lose 50% of your hands strength.

你可能覺得你的小拇指沒什麼用，但沒有他，你手掌的力量就會少掉 50%。

Sure, the index and middle finger are essential to help pinch and grab with the thumb,

當然，要捏或抓東西的話必須要食指、中指跟大拇指一起合作，

but it's your ring and pinky finger that give your hand power.

但無名指跟小拇指卻是提供你手的力量。

Now clasp one hand into the other - that's roughly the size of your heart.

現在把你兩手握起來，這大概就是你心臟的大小。

It beats 100,000 times per day, pumping 5.5 litres with each pulse, which is close to 3 million litres of blood every year.

心臟每天跳十萬下，每個脈搏輸送 5.5 公升的血，一年大約輸送300萬公升的血。

If you live to 75, it would fill 90 Olympic size swimming pools.

如果你活到 75 歲，心臟的輸血量能灌滿 90 個奧林匹克游泳池。

When it's all said and done, human decomposition begins around 4 minutes after death.

當心臟停止運作，四分鐘之後身體就會開始腐敗。

This process is known as self-digestion, in which your enzymes and bacteria eat you away.

這過程就是所謂的自體溶解，身體裡面的酵素與細菌會開始啃食身體。

In fact, three to five pounds of your body is made up of bacteria.

事實上，你身體有三到五磅是由細菌組成。

In an unclean mouth alone, 100 million to 1 billion bacteria can grow on each tooth,

光是一個不乾淨的嘴巴裡，就有一億到十億的細菌在每顆牙齒上，

with 32 teeth each, some of us have more bacteria in our mouth than there are people in the world.

有些人 32 顆牙齒上的細菌總數，甚至超越地球上的人口。

If that leaves you weak in the knees, don't worry, your bones are incredibly strong.

如果這樣就讓你腳軟的話，別擔心，你的骨頭比你想的還強壯。

When testing compression strength for a rate of 1 second, an 83-kilogram person with US shoe size 11 could have 16,000 people stand on their bone at once.

拿一個 80 公斤、穿 11 號鞋的男生來說，他骨頭一秒能承受的重量是 16,000 人一起站在他身上的重量。

That is, of course, if there was enough room.

不過前提是，要有一個足夠的空間能站上去。

And from the bones of our ancestors, we can extract DNA to learn about them.

我們還可以從祖先的骨頭中，萃取出 DNA 得到類似結論。

But if we were to take all of your DNA from your entire body and uncoil it,

但如果我們把你身體裡的 DNA 全部拿出來並且展開的話，

it would stretch about 10 billion miles, which is from here to Pluto and back.

他會有 100 億英哩長，相當於地球到冥王星來回的距離。

And if you took all of your veins, capillaries and arteries, and laid them end to end... you'd die.

如果你把身體裡的靜脈、微血管和動脈通通連在一起... 你就會死掉。

So... don't do that.

所以... 別這樣做。

Got a burning question you want answered?

有超想知道的問題需要解答？

Ask it in the comments or on Facebook and Twitter.

在留言欄、臉書或推特上詢問。

And if you want the inside scoop on upcoming episode ideas and behind-the-scenes,

如果你想搶先知道即將推出的影片或是幕後花絮，

check out our personal instagram and Twitter handles.

歡迎到我們的IG和推特逛逛。