How much percent of our brain do we use?

Dude.

You know I hate Math.

Alright.

We use only 10% of our brain is just a myth.

Through technologies like MRI and PET scan.

Scientists found that almost every part of the brain is used.

Even while performing any simple action, a majority part of our brain like the cerebellum.

Visual cortex and brainstem is active.

Even in sleep, areas which control emotions and memory are active.

Besides this, if only 10% of the brain is normally used.

Then damage to other areas shouldn't affect our daily functioning.

But we all know that is not the case.

Also, if 90% of the brain is not being used and if it doesn't provide any survival advantage.

Then it would have been eliminated by the process of natural selection.

But it hasn't.

This brings us to the conclusion that we use every part of the brain.

Topic: Heat transfer.

Why are cloudy nights warmer than clear nights?

Hey.

Look at the weather outside.

It is too cloudy.

No.

Don't go near that bonfire.

It is going to be warm tonight.

You don't want to listen to me, right?

Alright.

Go ahead.

Look.

I told you.

At least now will you listen to me.

During the day, our earth receives light from the sun and gets heated.

Now, during a clear night, that is, when there are no clouds.

This heat easily escapes through the atmosphere into space.

Resulting in cooling of the earth.

Now, to understand what happens on a cloudy night, let us heat the earth once again.

In this case, the clouds act like a blanket, preventing the heat from escaping into space.

Since the heat remains in the atmosphere, cloudy nights are warmer than clear nights.

Topic: Pneumonia.

What causes pneumonia?

The letter P.

No.

Pneumonia is a lung infection caused by microorganisms.

Which generally leads to difficulty in breathing.

Normally, we inhale oxygen-rich air which reaches our alveoli.

Alveoli are surrounded by blood capillaries.

Here, the oxygen through the walls of alveoli diffuses into our blood.

However, sometimes we also inhale harmful microorganisms.

Mostly, the cilia and mucus in our respiratory tract trap these microorganisms

Which are then expelled while coughing.

But sometimes the microorganisms don't get trapped and reach the alveoli.

There they start to multiply, causing lung infection, that is, pneumonia.

Oh no.

Now what to do?

Now, to protect ourselves, the immune cells start attacking the microorganisms, causing inflammation.

Accumulation of fluid in the alveoli.

As a result, the inhaled oxygen cannot get easily diffused into blood.

Thus causing difficulty in breathing.

What causes wrinkles?

A witch's potion.

No.

Our skin consists of two important proteins called collagen and elastin.

Collagen keeps our skin firm and tight.

While elastin gives our skin flexibility and elasticity.

It allows our skin to stretch, twist and contract.

Just like an elastic rubber band, right?

Absolutely.

But as we age, our skin produces less collagen and elastin.

Hence, our skin no longer remains firm.

It begins to lose elasticity.

As a result, our skin droops, thus causing wrinkles.

Moreover, there are some factors that can cause early wrinkling.

One of them is UV radiation of the sun.

Long term exposure to UV radiation can cause collagen.

Elastin to break down faster than normal.

Thus causing wrinkles in early age.

Besides this, smoking and poor nutrition may also contribute to early wrinkling.

What is a migraine?

A bad headache.

No.

A migraine is not just a bad headache.

It is often accompanied by other symptoms like vomiting, nausea, sensitivity to light, sound, etc.

Hence, migraine is actually a multi-symptom disorder.

Migraine headaches can last from 4 hours to 72 hours.

However, the duration and symptoms may vary from person to person.

Usually, the symptoms like food cravings, neck stiffness, yawning, constipation, etc.

May begin before the actual headache.

This period is called prodrome phase.

After this, the phase called aura begins in which an individual may experience blurred vision.

Slurred speech, pins and needles sensations, etc.

Then begins the attack phase when actual headache strikes.

The pain is often only on one side of the head and is accompanied by symptoms like nausea, vomiting, etc.

After the attack phase.

When the headache subsides, the individual may experience confusion, fatigue, etc.

This phase is called postdrome phase.