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  • Smart Learning for All

  • Why does our voice sound different when recorded?

  • Our inner ear detects sound vibrations informing our brain about the voice or sound and thus, helping us hear.

  • But did you know that when we speak, we hear our own voice in two different ways.

  • What?

  • In two different ways.

  • Indeed.

  • The first way is through our outer ear.

  • Our voice travels to the outer ear creating vibrations in the eardrum.

  • These vibrations eventually reach the inner ear.

  • While the second way is through our flesh and skull bones.

  • However, they are better at transmitting deeper, lower frequency sounds as compared to shriller.

  • Higher frequency sounds.

  • As a result, the combination of sounds obtained from the two ways makes our voice appear deeper.

  • Now, when we hear our recorded voice, we only hear the voice which has traveled through our outer ear.

  • Hence, our voice sounds different when recorded.

  • Why does airplane food taste bad?

  • I don't know.

  • Wait.

  • I will explain.

  • Our ability to perceive taste is affected by a few factors such as humidity, air pressure, etc.

  • In an airplane, the humidity is less as compared to that on the ground.

  • This makes the air in the airplane quite dry.

  • Also, to maintain the air pressure inside and outside the airplane

  • The air pressure inside it is decreased.

  • Decreased air pressure and dry air, dries our nose and mouth.

  • Dry nose cannot properly smell odors.

  • Yes.

  • I am not abe to smell the burger.

  • Now, smell of food helps us to understand the flavor and ingredients of the food.

  • Thus, the food which we cannot smell properly appears unappealing.

  • Also, dry mouth reduces the sensitivity of our taste buds.

  • As a result, we cannot perceive the taste of food properly.

  • Why can't dogs eat chocolates?

  • Because I would love to have all the chocolates for myself.

  • All right.

  • Now listen.

  • Chocolates and other cocoa products contain a toxic component called theobromine.

  • The darker the chocolate, the more theobromine and the more it is harmful.

  • But I eat chocolates.

  • And I am completely fine.

  • Our body quickly metabolizes the theobromine.

  • Thus, it is not quite harmful for us.

  • However, dogs process theobromine much more slowly.

  • So, it stays in their bodies for a longer time, resulting in vomiting, diarrhea, etc.

  • Moreover, if large quantities of chocolate are ingested by the dog.

  • The effects can be much more severe.

  • The heart rate of the dog might beat twice its normal rate, increasing the blood flow.

  • This can prove to be lethal to the dog.

  • Why do mosquito bites itch?

  • Because mosquitoes don't brush before biting.

  • No.

  • A mosquito doesn't actually bite.

  • What?

  • It doesn't bite.

  • No.

  • A mosquito sucks our blood through a straw like structure called proboscis.

  • A proboscis is made up of six parts.

  • Out of the six parts, four parts are used to pierce into our skin and blood vessels.

  • Hold the tissues apart.

  • Through the fifth part called hypopharynx.

  • The mosquito drops its saliva containing an anticoagulant.

  • Anticoagulant prevents the blood from clotting.

  • So that the sixth part of proboscis called labrum can easily suck up the blood.

  • Now, our immune system recognizes the anticoagulant as an invader.

  • Hence, it releases histamine.

  • Histamine dilates the blood vessels so that blood along with immune cells can come to attack the invaders.

  • Heal the affected area.

  • This histamine causes the itchy feeling.

  • How do bees make honey?

  • No idea.

  • To make honey, the worker honeybee sucks nectar from flowers and stores it in its honey stomach.

  • Once the worker bee returns to the hive, it vomits the nectar into a processor honeybee's mouth.

  • In the processor bee's mouth and stomach, an enzyme called invertase is added to the nectar.

  • Invertase breaks some nectar into simple sugars like glucose and fructose.

  • Then it vomits the partially converted nectar into another processor bee's mouth.

  • Who also adds more invertase, helping breakdown more nectar.

  • This process goes on until most of the nectar is converted into simple sugars.

  • Then the mixture of simple sugars is stored in the honeycomb.

  • At this point, the mixture is still watery.

  • Hence, the bees flap their wings which evaporates water and thickens the mixture to eventually form honey.

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B2 US nectar theobromine voice mosquito air pressure blood

How do bees make honey? plus 4 more videos.. #aumsum

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    AumSum posted on 2019/04/16
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