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  • It's AumSum Time

  • Can you guess the title of my next video?

  • Hurry up.

  • Write your guess in the comments section below.

  • What causes tides?

  • Tides are the periodic rise and fall of sea level at a particular place.

  • When the sea level rises to its greatest height.

  • It is known as a high tide and when the sea level drops to its lowest height, it is known as a low tide.

  • Tides are primarily caused due to the gravitational force of the moon.

  • But how?

  • Part of the earth facing the moon experiences a stronger gravitational pull towards the moon as compared to the earth's center.

  • So, the part facing the moon is pulled away from the center, creating a bulge.

  • Thus increasing the sea level and causing a high tide.

  • Now, the earth's center experiences a stronger gravitational force towards the moon.

  • Than the part facing away from the moon.

  • Hence, this part is pulled away from the center, resulting in high tide on the opposite side as well.

  • In addition to this, the places in between the two high tides, where the sea level drops, experience low tides.

  • Why do dogs wag their tails?

  • Coz they are happy!!

  • A dog's wagging tail doesn't always mean that it is happy or excited.

  • So, what does it mean??

  • Popular researches and studies over the years, suggest that the tail position.

  • Wagging direction represent different feelings or moods of dogs.

  • When the tail is hung down in its natural position, it means that the dog is calm, and is not worried.

  • If the tail is curled in between its legs, it indicates that the dog is scared or anxious.

  • When the tail is straight up.

  • It indicates that the dog is curious or wants to show other smaller dogs that it is bigger and dominant.

  • Moreover, if the tail wags towards right.

  • The dog is expressing positive emotions such as joy, excitement, etc.

  • However, if it wags towards left, it conveys negative emotions such as anxiety, stress, etc.

  • Why do birds need gravity to swallow food?

  • Maybe because they are fans of Newton!!

  • Nooo!!!

  • When humans eat food, it enters into a muscular organ called food pipe or esophagus.

  • In the esophagus, a series of contraction and relaxation take place that pushes.

  • Moves food towards the stomach.

  • This movement is called peristalsis.

  • Dude!!

  • Why do you use such complicated names??

  • Oh!!

  • Just listen!!

  • In most birds, such peristaltic movement doesn't take place in their esophagus.

  • Hence, they need to depend on gravity to push their food through the esophagus.

  • When a bird eats its food.

  • The bird lifts or tilts its head up and with the help of it directs the food towards the throat.

  • Then the gravitational force of earth causes the food to slide down into a pouch called crop.

  • Thus helping it to swallow its food.

  • Why do animals' eyes glow in the dark?

  • Coz they have hidden torches!!

  • Naahhh!!

  • Wait I'll explain!!

  • Our eyes have a layer called retina which is made up of photoreceptors.

  • When light enters our eyes, it hits the photoreceptors.

  • Photoreceptors detect light, thus making it possible to see.

  • However, the light which doesn't hit the photoreceptors remains undetected.

  • Ohh!!

  • Poor undetected light!!

  • Now, nocturnal animals like owls, need to see better during the night.

  • Hence, their eyes have another layer below the retina called tapetum lucidum.

  • Now, when light doesn't hit the photoreceptors, it reaches the tapetum lucidum.

  • This layer acts like a mirror.

  • It reflects light back onto the photoreceptors, thus giving them a second chance to detect light.

  • Some of this reflected light also comes out of the animal's eyes.

  • Thus, making it seem that its eyes are glowing.

  • Topic: Nerves

  • Why don't we feel pain when we cut our hair?

  • Well duh!!

  • Coz if it would, then we would have got angry on our hair dressers!!

  • Oh!!

  • You are just impossible!!

  • Wait!!

  • I will explain it to you.

  • Inside our body, there is a network of nerves.

  • These nerves help us to sense our surroundings and feel pain, touch, etc.

  • By sending messages to the brain.

  • So, do the nerves of my hair not know how to send a message??

  • Noo!!

  • Generally, the part of our hair above the skin is made up of dead cells.

  • It does not have any nerves.

  • Hence, when we cut our hair, due to the absence of nerves, our brain does not receive any messages of pain.

  • As a result, we don't feel any pain.

It's AumSum Time

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B1 中級

月はどうやって潮汐を起こすのか?| 月はどうやって潮の満ち引きを起こすのか|#aumsum (How does the Moon cause Tides? | #aumsum)

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    AumSum に公開 2021 年 01 月 14 日
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