Placeholder Image

Subtitles section Play video

  • It's AumSum Time

  • Can you guess the title of my next video?

  • Hurry up.

  • Write your guess in the comments section below.

  • Why is space black?

  • Coz somebody forgot to pay the electricity bill!!

  • Naahhh!!

  • Our sun is a huge star which emits a tremendous amount of light.

  • However, like our sun, there are so many stars in the universe that counting them is almost impossible.

  • So, if there are so many stars, the space shouldn't be black or dark, right?

  • Absolutely!!

  • However, this is not the case.

  • According to a study, the space appears black because the universe is expanding.

  • This expansion is causing the visible light emitted by the stars to stretch out so much that when it reaches our eyes.

  • They cannot detect it.

  • As our eyes cannot detect any visible light, the space appears black to us.

  • Moreover, light has a specific speed limit.

  • So, light from far far away stars has not even reached us.

  • Thus, the space appears black.

  • Why do we yawn?

  • Human beings, including some animals yawn.

  • What??

  • Animals also yawn!!

  • Absolutely!!

  • During yawning, which is also called oscitation, we take a deep breath of air.

  • Hence, a theory suggested that it helps our body bring in more oxygen and give out carbon dioxide.

  • However, it is incorrect.

  • A prevailing research suggests that yawning regulates our brain's temperature.

  • Our brain works best at certain temperatures.

  • But when we perform various activities throughout the day, our brain gets exhausted and sleep deprived.

  • Both exhaustion and sleep deprivation increase our brain's temperature.

  • Hence, to cool it down, we yawn.

  • While yawning, we stretch our jaw and propel blood through blood vessels to the brain.

  • Along with this, we inhale air through our mouth and nose.

  • Air cools the blood going to the brain which in turn decreases our brain's temperature.

  • How does blood clot?

  • With the help of glue!!

  • Not at all!!

  • Our blood consists of red blood cells, white blood cells, platelets, clotting factors, etc. suspended in a liquid plasma.

  • Hey!!

  • I too have a plasma, look!!

  • Oh!!

  • Please listen!!

  • Usually, when a blood vessel gets ruptured and we bleed, our blood begins to form a clot.

  • First, the platelets start sticking to the broken vessel and each other, thus forming a loose plug.

  • But this plug is not enough to stop bleeding.

  • Hence, the clotting factors take part in a complex chain of chemical reactions and create fibrin strands.

  • These strands criss-cross one another and create a mesh that tightly holds the loose plug together and makes it strong.

  • Red blood cells and white blood cells also get trapped in the mesh.

  • Thus creating a blood clot that completely stops bleeding.

  • What is a cataract?

  • It may be a cat's nickname!!

  • Nooo!!!

  • A cataract is an eye disease.

  • How does it form??

  • Wait!!

  • I'll explain!!

  • Each of our eyes consists of a transparent lens.

  • Is it similar to my camera lens??

  • Absolutely!!

  • Our eye lens is made up of water and protein.

  • They are arranged in such a way that keeps the lens clear, and lets light pass through it.

  • Hence, a sharp image is formed on the retina.

  • However, as we age, the protein begins to clump together, making the lens cloudy.

  • This clouding of our eye's natural lens is called a cataract.

  • In such situations, when light from an object enters our eye, the clumped protein blocks or scatters the light.

  • As a result, a blurred image is formed on the retina, thus making it hard to see.

  • Topic: Breathing

  • Why do we get hiccups?

  • Easy peasy!!

  • We get them when our friends think of us!!

  • No!!

  • We get hiccups mainly because of our diaphragm.

  • Diaphragm is a dome shaped muscle between our lungs and stomach.

  • It generally works perfectly.

  • Just like me, right??

  • Nah!!

  • When we inhale, our diaphragm contracts helping us take in air into the lungs.

  • When we exhale, it relaxes, helping us give out air.

  • However, sometimes this contraction does not happen properly.

  • One of the reasons is excess eating.

  • Eating too much too quickly causes our stomach to swell, causing discomfort to our diaphragm.

  • Due to this, our diaphragm contracts irregularly in a jerky way making us suck air suddenly.

  • This air rushes through our voice box, making the vocal cords to close suddenly, creating a hiccup.

It's AumSum Time

Subtitles and vocabulary

Operation of videos Adjust the video here to display the subtitles

B2 US blood diaphragm lens yawn brain black

Why is Space Black? | #aumsum

  • 14 1
    AumSum posted on 2019/04/18
Video vocabulary