Name: 火星真的是紅色的嗎？| 火星真的是紅色的嗎？ (Is Mars really Red? | #aumsum)
Uploaded: 2021-01-14T08:09:47.000Z
Duration: 6 min 46 s
Description: 【看影片學英語】數萬部 YouTube 影片，搭配英漢字典即點即查，輕鬆掌握單字發音與用法，長久累積看電影不必再看字幕。

Did you download my app from Google Play Store?

Remember, it's called ''It's AumSum Time''.

Now, let's guess the title of my next video.

Tapered end means greater surface area to
the bird's muscles.

That helps them to squeeze the egg out easily.

Write your guess in the comments section below.

Rocks and soil on Mars mostly contain iron.

Some areas are brown or green or even butterscotch-colored.

They kick up the rust into the atmosphere.

To understand this better, close your right
eye.

Now, are you able to see the table kept on
your right side?

Both our eyes work together and help us to
see, judge and perceive a view accurately.

Having two eyes provides us with a wider field of view.

When both our eyes are open, we get a horizontal field of view of about 180 degrees.

However, with only one eye open, we get a
horizontal field of view of only around 150 degrees.

We are unable to view around 20 to 30 degrees.

Hence, we were not able to see the table when our one eye was closed.

Did you know that our eyes see the same object from a slightly different angle?

Now, when you see only with your left eye,
the object will look like this.

While, when you see only with your right eye, the object will look like this.

Our eyes send these two slightly different
images to the brain.

The brain blends or combines both the images to make a three-dimensional image of the object.

But what is the use of a three-dimensional
image?

A three-dimensional image helps us to understand how far or how near an object is from us.

Facilitating better depth or distance perception.

This means having two eyes enables us to judge the distance of the object.

Or the depth at which the object is placed from us.

When we are embarrassed, ashamed or shy, we blush.

Blushing is governed by our sympathetic nervous system.

Its functioning is not under our control.

I cannot control my own sympathetic nervous system?

Now, when we are ashamed or shy, it causes us immediate stress.

When something causes immediate stress, our sympathetic nervous system considers it as a threat.

To defend the threat, this system orders our adrenal glands to release a hormone called adrenaline.

It expands the blood vessels so that more
blood and oxygen can be reached to our body parts.

Thus preparing our body for fight or
flight.

Now, as the blood vessels on our face are
very close to our skin surface.

They make our face appear red, that is, we blush.

Smell of old books is basically because of
paper and ink in those books.

Wood is made up of organic compounds like cellulose and lignin.

Over the years, these compounds react to heat, light and moisture.

VOCs stand for volatile organic compounds.

These compounds easily vaporize and mix in the air, thus forming the smell of old books.

A volatile organic compound called vanillin gives vanilla like smell.

Another VOC benzaldehyde gives almond like smell.

In short, the combination of various compounds makes old books smell so good.

Leaves contain various colored pigments like orange, yellow, green, etc.

But among all these pigments, only green colored pigment called chlorophyll traps sunlight.

Now, since green colored chlorophyll has such an important function.

The amount of chlorophyll is much higher in leaves.

Now during autumn or fall, there is not enough sunlight for chlorophyll to trap.

As a result, leaves are not able to prepare
much food.