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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''.

  • And follow my Facebook page.

  • Now, let's guess the title of my next video.

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

  • Then, why does it look red?

  • Hurry up.

  • Write your guess in the comments section below.

  • Why does a flame always point upward??

  • Muahahaha.

  • Because I told it to do so.

  • Oh.

  • Because of the flame, the air around the candle is hot.

  • Rise hot air, as you are lighter.

  • Come cold air.

  • Take its place, as you are heavier.

  • Now, cold air also gets heated and rises again.

  • This continuous cycle of hot air rising, cold air rushing in, getting heated.

  • Causes a swirling effect.

  • And that, makes the flame point upward.

  • Topic: Concave mirror.

  • Why is your reflection upside down on a spoon?

  • Looks like you are getting ready to go for a party.

  • Why don't you stand here and then look into the spoon?

  • Don't worry.

  • Your image appeared upside down because of the inward curve of the spoon.

  • The surface of the spoon which is curved inwards acts like a concave mirror.

  • You look confused.

  • Let me explain.

  • A concave mirror is a mirror whose reflecting surface is curved inwards.

  • Being curved inwards, it reflects or bounces back the light rays in a different manner.

  • When you see yourself in a spoon which is like a concave mirror.

  • The light rays from your face fall on the top of the spoon and get reflected downwards.

  • While, the light rays from your feet fall on the bottom of the spoon and get reflected upwards.

  • As a result, you see yourself upside down.

  • Now, the point where all these light rays meet is called the focal point.

  • When you stand beyond this point, only then will you be able to see an inverted image of yourself.

  • However, if you stand before the focal point, the image will look upright.

  • Topic: Archimedes' principle.

  • Why do ships float?

  • Good question.

  • Give me minimum five years to unravel its mystery.

  • Alright.

  • Don't bother.

  • To answer this question, we need to understand Archimedes' principle.

  • Archimedes' principle states that an object partly.

  • Or fully immersed in a liquid experiences an upward force called buoyant force.

  • Which is equal to the weight of the liquid displaced by it.

  • Oh man.

  • It is too complicated.

  • Okay.

  • Wait, I'll explain.

  • A ship has a long and wide base due to which the amount.

  • The weight of water displaced by it increases.

  • Now according to Archimedes' principle, the buoyant force is equal to the weight of displaced liquid.

  • Hence, as the weight of displaced water increases.

  • The buoyant force that is the upward force exerted by the water increases, making the ship float.

  • What is déjà vu?

  • It is a magical power.

  • No.

  • Déjà vu is a French term which literally means 'already seen'.

  • As the name suggests, it is a strange feeling that the current situation has happened before.

  • It is an experience in which places seem familiar, although you have visited that place for the first time.

  • But what causes déjà vu?

  • One of the prevailing theories suggests that sometimes.

  • Visual information from one of our eyes is transmitted a little late to the brain.

  • So information from first eye reaches the brain first.

  • Now, when the information from the other eye reaches the brain a little late.

  • Our brain receives the same information twice.

  • Hence, the situation or place appears familiar.

  • It appears as if we have seen it already, that is, we experience déjà vu.

  • Can animals get a sunburn?

  • Yes.

  • Due to ultraviolet radiation of the sun, animals can also get sunburns.

  • However, to protect themselves from the harmful radiation.

  • Different animals have different biological defenses.

  • For example, reptiles have scales, birds have feathers, animals like sheep.

  • Dogs and cats have fur or hair, sperm whales have a special protein, fin whales have more melanin, etc.

  • Does anybody have Captain America's shield?

  • Please listen.

  • Some animals even produce certain substances to protect themselves from the harmful radiation.

  • For example, hippopotamuses secrete a fluid made up of red and orange pigments.

  • Some fish, amphibians, reptiles and birds produce a chemical called gadusol.

  • In addition to this, animals like rhinoceroses, elephants and pigs take mud baths.

  • It is said that mud acts like a physical barrier between their skin and ultraviolet radiation.

  • Thus preventing them from getting sunburns.

It's AumSum Time

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