Placeholder Image

Subtitles section Play video

  • It's AumSum Time

  • Hi guys.

  • Can you guess the title of my next video?

  • What happened?

  • AumSum to the rescue.

  • Hurry up.

  • Write your guess in the comments section below.

  • Shush.

  • Somebody's talking.

  • It's the trees.

  • Beneath our feet, thousands of tree roots are connected to one another by fungi.

  • Whose roots penetrate and spread into the ground.

  • They form a network called mycorrhizal network.

  • Through which trees send chemical signals and talk to each other.

  • Big mother trees called Hubs send nourishment to smaller plants, helping them grow.

  • Also, a dying tree deposits its resources in the network for other trees to use.

  • Why is ocean water salty?

  • Several natural processes make ocean water salty.

  • For example, when it rains, the water droplets react with carbon dioxide in the atmosphere.

  • Form carbonic acid, making rainwater slightly acidic.

  • This acidic rainwater reacts with minerals present in the rocks and forms new minerals and salts.

  • These minerals and salts are then carried by flowing water to the oceans.

  • Thus making the ocean water salty.

  • In addition to this, along the mid-ocean ridges, magma rises close to the oceanic crust.

  • Here, when the salty ocean water seeps into the earth's crust, it gets hot due to magma.

  • This hot water dissolves more minerals present in the crust.

  • Carries them to the oceans through fissures called hydrothermal vents.

  • Thus making the ocean water salty.

  • Topic: Air pressure.

  • How do straws work?

  • They work very hard.

  • Oh no.

  • Straws work because of air pressure.

  • Is it similar to acupressure?

  • No.

  • Air pressure is the weight of air pressing down on earth and all other objects present on it.

  • Now, when a straw is in a liquid, the air pressure upon the liquid in the glass.

  • The air pressure upon the liquid in the straw is similar.

  • Causing the levels of liquid to be almost equal.

  • However, when we drink the liquid through straw.

  • We first inhale causing the air from the straw to flow into our lungs.

  • Now due to the absence of air, the air pressure in the straw decreases.

  • Hence, the air pressure present on the liquid of the glass pushes the liquid into the straw.

  • Causing it to move upwards and thus, helping us drink.

  • Topic: Human bones.

  • How does a bone heal?

  • Ha, simple!!

  • By a bandage.

  • No.

  • Bones are one of the most important parts of our body.

  • They not only provide structural support but also produce red blood cells.

  • What?

  • Our bones produce red blood cells?

  • Absolutely.

  • Hence, when we crack or break a bone, it is very important to heal it.

  • In the healing process, cells called chondrocytes produce collagen which forms cartilage.

  • This cartilage bridges the gap between the broken bones, thus producing a soft callus.

  • Then, special cells called osteoblasts create a hard bony callus using collagen.

  • And minerals like calcium and phosphorus, thus forming our new bone.

  • However, this new bone is irregular in shape.

  • Hence, cells called osteoclasts start remodelling the bone.

  • Resulting in the formation of bone similar to the original shape.

  • Are you afraid of heights?

  • Do you think it is because of vertigo?

  • Vertigo is not necessarily fear of heights.

  • In medical terms, vertigo refers to a false sensation of movement due to which we feel dizzy.

  • The most common type of vertigo is Benign Paroxysmal Positional Vertigo or BPPV.

  • It is caused when our inner ear which helps us maintain balance by detecting motion.

  • And position of our body, doesn't function properly.

  • Normally, when we move our head, the cilia and calcium crystals in our inner ear move.

  • Thus sending signals to the brain about our movement.

  • However, sometimes some crystals dislodge and move into the fluid-filled semicircular canals.

  • Now, when we move our head, the crystals move along with the fluid.

  • However, even after our head movement has stopped, the crystals keep moving in the canals.

  • Thus sending wrong signals to the brain that our head is still moving.

  • Due to this wrong information, the person gets a false sensation of movement which makes him feel dizzy.

  • Thus causing vertigo

It's AumSum Time

Subtitles and vocabulary

Click the word to look it up Click the word to find further inforamtion about it