Subtitles section Play video
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It's AumSum Time
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Hi guys.
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Can you guess the title of my next video?
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Blood rain.
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Relax.
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Hurry up.
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Write your guess in the comments section below.
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Why do we feel butterflies in our stomach?
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Because I have invited them to my party.
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No.
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Butterflies in our stomach are basically caused by our autonomic nervous system or ANS.
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ANS regulates our involuntary functions like heartbeat, blood flow, digestion, etc.
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Also, during stressful situations such as when a ferocious animal comes in front of us.
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A part of ANS called the sympathetic nervous system prepares our body for fight or flight.
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This means, it redirects blood from other parts of the body to mostly our hands and legs.
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So that they get sufficient oxygen and nutrients and thus, help us fight or flight.
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So then, why do we feel butterflies in our stomach?
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It is believed that since blood is redirected from the stomach.
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Millions of sensory nerves in it detect a sudden decrease in oxygen.
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Hence, in response to this, the nerve cells create the feeling of butterflies.
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Also, because of blood redirection, it is thought that the stomach contracts.
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Thus contributing to the feeling of butterflies.
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What is a mirage?
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An invisible cloak.
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No.
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Mirage is an illusion in which it appears as if there is water present on the ground.
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On a hot day, the land heats the layers of air closer to it.
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However, as we move higher, the layers of air get relatively cooler.
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Thus, the hot lower layers of air near the ground form rarer media and cold upper layers form denser media.
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Now, when light coming from sky travels from denser to rarer media.
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It bends more and more until it exceeds the critical angle.
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That is, the angle beyond which light gets reflected.
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This phenomenon is called total internal reflection.
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When this reflected light reaches our eyes, our eyes trace it backward as a straight line.
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Hence, the reflection of blue sky appears on the ground and our brain thinks that there is water.
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Thus causing a mirage.
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Topic: Rain.
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Why does rain smell?
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Maybe it applies a special perfume.
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No.
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Rain is just water and water doesn't have any smell.
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Yes dude.
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So, what's that smell?
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The distinctive smell which frequently accompanies the first rain.
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After a dry weather is scientifically called petrichor.
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It basically comes from plants and bacteria called actinomycetes which live in the soil.
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Now during a long dry spell, the plants release oils into the soil to block other seeds from germinating.
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Thus reducing competition for water.
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Whereas, the actinomycetes produce a chemical called geosmin.
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Now when rain hits the ground, it brings up the oils and geosmin which then mix with air.
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The combination of this geosmin along with the plant oils form the smell which we receive after the rain.
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Topic: Red eye effect.
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Why do my eyes glow red in photos?
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Because there is a devil hidden in you.
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Stop bluffing.
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Alright.
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I'll explain.
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It happens because of blood vessels in our eyes and pupil.
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Pupil is a small opening whose size is adjusted by the circular muscle called iris.
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In bright light, the iris contracts making the pupil smaller.
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Thus allowing less light to enter into our eyes.
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In dark, the iris relaxes making the pupil larger, thus allowing more light to enter.
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Also exposing the blood vessels in our eyes.
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Hence, when we take a photo in such a dark environment.
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The flash of light from the camera floods into our eyes at once.
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Some of this light gets reflected from the blood vessels onto the camera before our iris can contract.
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Making our eyes glow red in photos.
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Why smoking makes people look old?
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So that we look more experienced and intelligent.
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No.
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Smoking makes people look old because things like cigarettes contain nicotine.
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Nicotine is a vasoconstrictor which means it narrows our blood vessels.
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Restricting the blood supply.
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When the blood supply is restricted, our cells don't get the required oxygen and nutrients.
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As a result, our skin becomes dry and discoloured.
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In addition to this, the collagen and elastin fibers which keep our skin firm and elastic.
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Begin to break down much faster, leading to saggy and wrinkled skin.
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Also, when we smoke, we purse our lips and squint our eyes.
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Regularly repeating these actions may also cause wrinkles on our lips and around our eyes.
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In this way, smoking makes our skin dry, saggy and wrinkled, thus making us look old.