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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.

  • How are smartphones changing us?

  • No one can change the one and only AumSum.

  • You show off.

  • Bending and staring down at our phones for several hours.

  • Increases the stress on our neck and spine, leading to neck and back pain.

  • Experts refer to this condition as text neck and it can eventually lead to serious consequences.

  • Also, at night, when we stare at our smartphones.

  • The light emitted from their screens makes our brain think that it is still daytime.

  • So, our brain does not produce the sleep hormone melatonin, causing us to stay awake for long hours.

  • Thus, disturbing our circadian rhythm which regulates our every day bodily functions.

  • This can lead to obesity, diabetes, cancer, etc.

  • An interesting fact is that smartphone addiction has given rise to a new phobia called Nomophobia.

  • Short for no mobile phone phobia.

  • It is basically the fear or anxiety of being without our phone.

  • Topic: Human Nose.

  • Why do we get nosebleeds?

  • I don't know.

  • Alright.

  • I'll explain.

  • The medical term for a nosebleed is epistaxis.

  • The most common epistaxis is anterior epistaxis where bleeding happens from the front part of our nostrils.

  • Each of our nostrils has a mass of blood vessels called Kiesselbach's plexus which is very close to the skin surface.

  • Now, usually the mucus moisturizes the skin in our nose, thus protecting the blood vessels in it.

  • Mucus is so useful.

  • Yes.

  • It is.

  • However during winter, the air is dry.

  • Hence, when we inhale this dry air, it draws moisture from the mucus which in turn leads to the drying of skin in our nose.

  • Now, some people's skin is very sensitive.

  • If it dries, the skin and blood vessels in it get easily damaged.

  • Causing an anterior epistaxis or nosebleed.

  • Why do elephants have big ears?

  • To fly.

  • Not at all.

  • Ears basically help to hear.

  • Besides this, big ears of the elephants also help it to regulate its body temperature.

  • But how can ears help to regulate body temperature?

  • In living beings like elephants, blood supplies heat to all parts of the body.

  • Thus helping it to maintain the body temperature.

  • However, due to metabolic activities or hot climate, sometimes heat in the blood can increase.

  • Thus increasing the body temperature of the elephant.

  • Now an elephant's big ears are filled with blood vessels which are very close to the surface of the skin.

  • Hence, when blood having more amount of heat flows through the ears of the elephant.

  • The heat from the blood escapes into the atmosphere, cooling the blood and in turn cooling the elephant.

  • What are those 'Do not eat' packets?

  • It is a top secret.

  • No.

  • It's not.

  • Do not eat packets usually contain silica gel which is a form of silicon dioxide.

  • Silica gel packets or do not eat packets are commonly found in products like packaged foods, leather articles, etc

  • Because these products get spoiled by moisture.

  • Silica gel helps to keep them safe by adsorbing the moisture.

  • You mean absorbing the moisture, right?

  • No.

  • Absorption is a process in which a substance is taken into another substance.

  • Whereas, adsorption is a process in which a substance attracts and holds another substance on its surface.

  • Now, silica gel contains millions of microscopic pores.

  • If there is any moisture present around the leather articles or packaged foods, then the pores of silica gel attract the moisture.

  • Hold it on their surface, preventing the products from getting spoilt.

  • Topic: Light and Sound.

  • Why do we see lightning before thunder?

  • Don't go out tonight.

  • A huge storm is coming.

  • Look at the weather outside.

  • See, there's a huge lightning strike.

  • Now, very soon, you are going to hear some thunder.

  • I told you.

  • Don't get scared.

  • Its just thunder.

  • Do you know why you saw the lightning before you heard the thunder?

  • I will tell you.

  • An interesting fact is that lightning and thunder occur at the exact same time.

  • Then why do we see lightning first?

  • This is because light travels faster than sound.

  • The speed of light is 300 million meters per second while the speed of sound is only 340 meters per second.

  • Thus, the light from the lightning travels much faster to our eyes.

  • As a result, we first see the lightning, shortly followed by the sound of thunder.

It's AumSum Time.

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