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  • It's AumSum Time

  • Hey guys.

  • Hold on.

  • 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.

  • Hurry up.

  • Write your guess in the comments section below.

  • Is Mars really red?

  • Am I really human?

  • Rocks and soil on Mars mostly contain iron.

  • Here comes atmospheric oxygen.

  • Reacting.

  • Reddish iron oxide or rust is formed.

  • So, Mars is red.

  • Let's look through the rovers.

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

  • Then, why does it look red?

  • Dust Storms.

  • They last for weeks or months.

  • They kick up the rust into the atmosphere.

  • Thus, giving it a reddish color.

  • Topic: Eyes

  • Why do we have two eyes instead of one?

  • You don't know?

  • Okay.

  • To understand this better, close your right eye.

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

  • You are not able to see it, right?

  • Okay.

  • Let me tell you why.

  • 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.

  • Hey.

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

  • You don't believe me?

  • Alright.

  • Look at this object.

  • Both your eyes see the object like this.

  • 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.

  • Hey.

  • 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.

  • Topic: Blushing

  • Why do we blush?

  • I don't know.

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

  • Blushing is governed by our sympathetic nervous system.

  • Its functioning is not under our control.

  • What?

  • I cannot control my own sympathetic nervous system?

  • Absolutely.

  • 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.

  • Adrenaline speeds up our breathing rate.

  • 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.

  • Why do old books smell so good?

  • Because books secretly apply perfume.

  • No.

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

  • Paper is primarily made up of wood.

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

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

  • Begin to breakdown releasing VOCs.

  • VOCs means vanilla orange cakes, right?

  • No.

  • VOCs stand for volatile organic compounds.

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

  • Now, there are different types of VOCs.

  • A volatile organic compound called vanillin gives vanilla like smell.

  • Another VOC benzaldehyde gives almond like smell.

  • Ethyl benzene gives a sweet smell.

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

  • Why do leaves change color and fall?

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

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

  • Helps leaves prepare food.

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

  • The amount of chlorophyll is much higher in leaves.

  • Causing them to usually appear green.

  • No, they're black.

  • Oops, I'm wearing sunglasses.

  • 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.

  • Hence, the plant begins to shed its leaves instead of wasting energy on their maintenance.

  • However,

  • Before shedding, the plant absorbs required nutrients from the leaves and breaks down chlorophyll.

  • Now, since chlorophyll is broken down, other pigments in leaves become visible.

  • Resulting in the change of color.

It's AumSum Time

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B1 US chlorophyll object vocs smell blush colored

Is Mars really Red? | #aumsum

  • 16 0
    Amy.Lin posted on 2019/04/11
Video vocabulary