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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Hurry up.
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Write your guess in the comments section below.
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Are wisdom teeth still useful?
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Obviously.
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Because wisdom teeth make us intelligent.
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No.
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There are 32 permanent teeth, out of which four wisdom teeth begin to grow a little late.
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Now, when our ancient ancestors used to eat plant material and raw meat.
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They required big strong jaws and wisdom teeth to chew their food.
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As they learned to cook food, they no longer required those big jaws.
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Hence, through evolution, the jaws started to get smaller and smaller.
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But the wisdom teeth did not disappear through evolution.
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They still exist.
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But since they appear a little late, the remaining teeth usually take up the available space in the small jaw.
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Leaving no room for the wisdom teeth.
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Hence.
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They begin to grow at odd angles and push other teeth causing pain, swelling, tooth decay and even infection.
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Hence, in such cases, wisdom teeth can prove to be harmful and not useful.
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Why are airplane windows oval?
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Because I told the airplane manufacturers to do so.
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Stop bluffing.
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When airplanes fly at higher altitudes.
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The air pressure inside the airplane is more than the air pressure outside.
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Hence, the cabin slightly expands, thus creating stress which flows through the cabin's material.
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Now, when the windows were square or rectangular.
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The stress caused tension to build up at the corners of square windows.
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This tension produced cracks in the cabin, thus leading to crashes.
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So sad.
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Hence, this design flaw was corrected by making windows oval.
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Oval windows provide a smoother path for stress to flow due to which tension is not produced.
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Hence, airplanes are safe.
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How do migratory birds find their way?
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With the help of GPS.
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No.
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Every year, many migratory birds fly thousands of kilometers to find food, to avoid extreme weather, etc.
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But researchers don't know how these birds find their way and travel to the same location year after year.
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However.
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An observation suggests that migratory birds can detect the earth's magnetic field lines.
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That appear to emerge from south pole and merge into north pole.
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When migratory birds have to travel from north to south or vice versa.
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They align themselves with the magnetic field lines and travel to their location.
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Along with this.
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Migratory birds may also find their way by creating a mental map of their route using mountains, rivers, etc.
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Besides this.
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It is also believed that migratory birds use the location of the sun and stars.
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To find their way and reach the same location.
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Topic: Taste Buds
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Why mint tastes cold?
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Maybe because it is manufactured in Antarctica.
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Not at all.
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Wait, I'll explain.
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Our tongue is actually a muscle which consists of many taste buds or receptors.
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Are they similar to my earbuds?
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No.
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When foods having flavors such as sweet, salty, sour, bitter or umami.
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Come in contact with these taste receptors and activate them.
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They send signals to the brain, telling us their taste.
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However, when we eat mint, it feels or tastes cold.
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This is because mint contains a compound called menthol.
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Menthol does not activate the taste receptors.
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But instead it activates the cold sensing receptors in our tongue.
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Hence, these receptors send messages to our brain signaling cold.
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As a result, the brain thinks that something cold is present in our mouth.
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Thus making mint taste cold.
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Why does salt make food taste better?
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Wait.
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I'll explain.
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Salt which is basically sodium chloride makes almost everything taste better.
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Whether it is French fries, certain fruits, curries or even cookies.
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We like at least a little salt in all these foods.
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According to researchers.
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We have evolved to like salt maybe because our bodies need salt for survival.
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What?
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Salt for survival.
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Indeed.
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Sodium present in salt, maintains our blood pressure, transmits nerve impulses, etc.
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Whereas, chloride is used to produce hydrochloric acid in our stomach.
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Hence, to obtain salt, we have gradually developed a taste for it.
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Thus, salt in food makes it appealing and tasty.
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In addition to this, it is found that salt suppresses bitterness better than sugar.
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Researchers aren't sure how.
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Some researchers suggest that salt neutralizes the bitter tongue receptors.
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While some suggest that on adding salt, the brain interprets the taste as less bitter.
