B1 Intermediate US 15 Folder Collection
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Why do snakes have forked tongue?
Just for fashion.
Even though snakes have noses, they smell odors of their prey.
Mate or surroundings with the help of their tongue and vomeronasal organ.
Each time a snake flicks its tongue in air,
it collects odor particles.

Then when the tongue is brought back, the
particles are transferred to the vomeronasal organ.

This organ detects the odors and sends signals to the brain, helping the snake smell.
That's interesting.
Now, we know that when we see with our two separate eyes, our brain combines the two different perspectives.
Makes a detailed image of our surrounding.
Similarly, because the tongue of a snake is forked, it collects odor particles from two different locations.
Helping the snake understand in which direction the odor is coming from.
Thus, making it easier to locate the prey.
Why do mosquito bites itch?
Because mosquitoes don't brush before biting.
A mosquito doesn't actually bite.
It doesn't bite.
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 and 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.
Why do we breathe through one nostril?
No idea.
Our nostrils have specialized tissues.
At a given time, these tissues are swollen
in one nostril while they are shrunk in the other.

Hence, when we breathe, air passes easily
through the nostril in which the tissues are shrunk.

However, due to the swelling, very less amount of air slowly passes through the other nostril.
Thus, it seems as if we are breathing through one nostril only.
However, after sometime, the swelling and
shrinking in the nostrils reverses.

This breathing pattern is called nasal cycle.
Nasal cycle is beneficial for us.
But how?
Some odors are detected better in fast-moving air, while others in slow-moving air.
Thus, with fast-moving air in one nostril
and slow-moving air in the other.

Our nose can detect a greater range of smells.
Besides this, our nostrils are moist.
Continues breathing can make them dry.
Hence, when we breathe through one nostril, the other nostril gets time to become moist again
What is color blindness?
A color festival.
Color blindness or color deficiency is a vision problem.
Now, our eyes have light sensitive cells called rods and cones.
Can I put ice cream on these cones?
You are just unbelieveable.
Rods are responsible for black and white vision.
They do not detect color.
Whereas, cones detect color.
There are three types of cones.
One cone perceives red light, another perceives green and the third perceives blue.
Together, these cones help us to see the whole spectrum of colors.
Now in some cases, when one or more types of cones do not work properly, it causes color blindness.
People with such deficiency have difficulty
in distinguishing between certain colors or shades.

For example, in red green color blindness,
the apple tree may appear like this.

Topic: Latent heat of vaporization.
Why do wet clothes feel cold?
I don't know.
It is because of latent heat of vaporization.
Latent heat of vaporization is the amount
of heat energy required to change a unit mass of liquid into vapor.

Now, the value of latent heat of vaporization of water is very high.
Is it higher than Mount Everest?
The latent heat of vaporization of water is
about 22 point 6 times 10 to the fifth joules per kilogram.

This means it is smaller.
Please listen.
This means only 1 kilogram of water requires 22 point 6 times 10 to the fifth joules of heat energy to change to vapor.
Now, when we wear wet clothes, the water present in them absorbs quite a lot of latent heat from our body.
Evaporates into the atmosphere,
making us feel cold.

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Why do Snakes have Forked (Split) Tongue? | #aumsum

15 Folder Collection
AumSum published on April 15, 2019
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