Hey there, I'm Blocko.

大家好，我是 Blocko。

And I might be an ageless animation, but you, on the other hand, are getting older every day.

我是個沒有年齡的動畫，但你每天正不斷的變老，

And with old age, comes a lot of interesting changes.

並且隨著年齡產生許多有趣的變化。

It's Thursday, so that means we're answering one of your questions.

今天是星期四，所以我們會回答你們問的其中一個問題。

And this week, we're gonna find out why does hair turn gray with old age. Let's do this.

這星期我們將要了解為什麼老了頭髮就會變白。我們開始吧！

Let's figure out how hair gets its color in the first place.

讓我們先了解頭髮是怎麼有顏色的。

Hair, like the skin, gets its color from a pigment called melanin.

頭髮跟皮膚一樣，是從一種黑色素得到顏色。

Did you know that melanin formation happens before we were born?

你知道黑色素在我們出生前就形成了嗎？

Did you know that all hair is white before it grows?

你知道所有頭髮在長出來以前都是白色的嗎？

Well, you do now.

你現在知道了。

Dark pigments are called the eumelanin, and light pigments are called pheomelanin, which blend together to create a broad spectrum of beautiful hair colors.

深色的色素叫「真黑素」，淺色的叫「褐黑素」色素，混和在一起會創造出許多漂亮的髮色。

These pigments are composed of cells called melanocytes that are positioned on the skin surface, which the hair follicles grow through.

這些色素由黑色素細胞組成的，他們位在皮膚表面，而那也是毛囊生長的地方。

Melanocytes inject melianin into cells that contain keratin, which the protein of hair is made up of.

黑色素細胞把黑色素注入細胞，而這些細胞裝著角質素，就是製成頭髮蛋白質的角質素。

There are many factors that can change the pigment of your hair, both internal and external.

有很多因素可以改變你頭髮的色素，包含內在因素和外在因素，

Things such as genetics, hormones, age, the climate that you live in, toxins and even chemical exposure can all affect hair pigmentation.

像是基因、賀爾蒙、年齡、你居住地的氣候、毒素甚至是暴露在化學因子下都可以影響頭髮的顏色。

I would check with your parents or grandparents and find out when they went gray.

我建議問問你的爸媽或祖父母他們的頭髮什麼時候開始變白的。

That's when you probably will too.

而你的頭髮也有可能在那個年齡會變白。

As you grow older, your hair turns gray is the result of fail management of melanin cells.

隨著年齡增長，變白的頭髮是黑色素細胞失調的結果。

They may die or just function improperly.

它們可能是死掉了，或者是不恰當的運作。

The less melanin you have, the grayer your hair becomes.

你的黑色素越少，你的頭髮就會變得越白。

Each hair follicles grow separately and contains its own amount of melanin.

每個毛囊都各自生長，容納著不同數量的黑色素。

This is why certain hairs turn gray at different times.

這就是為什麼每根頭髮都在不同的時間變白。

There's still no solid proof as why this happens.

目前還沒有明確的證明可以解釋它的發生。

More recent studies have shown that hair follicles produce small amount of hydrogen peroxide, which over time can lead to gradual loss of hair color.

許多最近的研究顯示，毛囊會製造少量的過氧化氫，隨著時間過去，過氧化氫會導致頭髮漸漸褪色。

I personally would take great care over a hairless blockhead any day.

我個人會隨時好好照顧我沒有頭髮「方塊頭」(註：blockhead 也有笨蛋的意思)

Thank you so much for watching.

非常感謝你的觀看。

As usual, I'll be answering a new question every Thursday, so ask anything you wanna know in the comments on Facebook and Twitter.

跟平常一樣，我每個星期四會回答新的問題，所以請你問任何你想了解的問題，把它留言在 Facebook 或 Twitter上。

If you like this video, you should definitely click the one that just popped up on the screen or check the description for the link.

如果你喜歡這個影片，你絕對要點擊剛跳上螢幕的東西或到說明欄找到連結。