Why do mosquitoes bite only some people?

なぜ蚊は何人かだけを噛むのですか？

Because they are lazy.

彼らは怠け者だから。

No.

いいえ。

There are a number of reasons why some people are more prone to mosquito bites.

一部の人々が蚊に刺されやすい理由はいくつかあります。

One of them is body odor.

その一つは体臭です。

Millions of bacteria which live on our skin produce various gases.

私たちの皮膚に生息する数百万の細菌は、様々なガスを産生します。

These gases form our body odor.

これらのガスは私たちの体臭を形成します。

Some of these body odors attract the mosquitoes.

これらの体臭のいくつかは蚊を引き付ける。

So, this is the reason why mosquitoes prefer me.

だから、これが蚊が私を好む理由です。

Besides this, a popular research found that.

この他にも、人気のある研究がそれを発見しました。

Mosquitoes tend to bite people with Type O blood nearly twice as often as those with Type A.

モスキートは、タイプOの血液を持つ人をタイプAの人の2倍近く噛む傾向があります。

Exercising can also entice mosquitoes.

エクササイズは蚊を誘惑することもできます。

This is because when we exercise, we release more carbon dioxide, heat, and sweat.

これは、私たちが運動すると、より多くの二酸化炭素、熱、および汗を放出するからです。

Mosquitoes can detect this carbon dioxide and heat.

蚊はこの二酸化炭素と熱を検出することができます。

They can also sense various substances in our sweat such as lactic acid.

乳酸などの汗に含まれるさまざまな物質を感知することもできます。

Thus making us more likely to get bitten.

したがって、私たちは噛まれる可能性が高くなります。

Why does hot air balloon float?

なぜ熱気球は浮くのですか？

Because it has invisible wings.

それは目に見えない翼があるからです。

No.

いいえ。

It is because of density.

それは密度のためです。

Density is the measure of mass present per unit volume.

密度は、単位体積当たりに存在する質量の尺度である。

Lesser the density, lighter will be the object.

密度が低いほど、オブジェクトは軽くなります。

Now, density varies with temperature.

今、密度は温度によって変化する。

It is so complicated.

それはとても複雑です。

All right.

大丈夫。

I will explain.

私は説明します。

When a hot air balloon is on ground, the air inside and outside the balloon is of same temperature and density.

熱風バルーンが地上にあるとき、バルーンの内側および外側の空気は同じ温度および密度である。

However, when we turn on the burner of the balloon, the air inside the balloon starts getting hot.

しかし、バルーンのバーナーをオンにすると、バルーン内の空気が熱くなり始めます。

The molecules of air move faster and spread apart, taking up more space.

空気の分子はより速く動いて離れて広がり、より多くの空間を占めます。

Hence, the air inside the balloon becomes less dense than the air outside.

したがって、バルーン内の空気は、外側の空気よりも密度が低くなる。

As less dense air is lighter, the hot air balloon rises and thus, begins to float.

より密度の低い空気がより軽くなるにつれて、熱気球が上昇し、したがって浮揚し始める。

What happens if a plane is struck by lightning?

飛行機が雷に襲われたらどうなりますか？

It will start glowing like a disco ball.

それはディスコボールのように輝き始めるでしょう。

No.

いいえ。

Lightning is a massive flow of charge which carries thousands of volts of electric current.

雷は、数千ボルトの電流を運ぶ大量の電荷です。

Thus, it is extremely fatal for living beings and can damage anything that comes in its way.

したがって、それは生存者にとって非常に致命的であり、途中で来るものにはダメージを与える可能性があります。

Yes.

はい。

It is really terrifying.

それは本当に恐ろしいです。

Now many times, airplanes get caught in a heavy lightning storm.

今や何度も飛行機が激しい雷雨に巻き込まれてしまいます。

However, airplanes are designed to handle the lightning strikes.

しかし、飛行機は落雷に対処するように設計されています。

The outer skin of most planes is primarily made of aluminum.

ほとんどの平面の外板は、主にアルミニウム製です。

Aluminum is a good conductor of electricity.

アルミニウムは電気の良導体です。

When lightning hits the airplane, the electric current travels through the outer skin of the plane.

雷が飛行機に当たると、電流は飛行機の外板を通過します。

It does not pass into the plane.

それは飛行機に入ることはありません。

Eventually, it exits off through another extremity, such as tail.

最終的に、それは尻尾のような別の先端を通って出る。

Thus, the airplane and the passengers within remain protected.

したがって、飛行機および乗客は保護されたままである。

Why can't we tickle ourselves?

なぜ私たちは自分自身をくすぐりませんか？

Because we are lazy.

私たちは怠け者だから。

No.

いいえ。

Areas that are more prone to getting tickled are our vulnerable areas like neck, stomach and armpits.

気になる傾向があるエリアは、頸部、胃、脇の下のような脆弱なエリアです。

Yes.

はい。

You are right.

あなたが正しいです。

Some researchers suggest that laughing on getting tickled by others could be a defense mechanism.

いくつかの研究者は、他者に笑顔を浮かべて笑うことは、防衛の仕組みになると示唆している。

It has evolved over the years when touched suddenly in vulnerable areas.

それは、脆弱な地域で突然触れたとき、何年にもわたって進化してきました。

This laughter could either be a way to laugh out of a tense situation.

この笑い声は、緊張した状況から笑う方法のいずれかである可能性があります。

To show submission to the person tickling you to stop further tickles.

あなたにくすぐる人に提出を示して、さらにくすぐりを止める。

Now, when we tickle ourselves.

今、私たちは自分自身をくすぐります。

Our brain is programmed in such a way that it predicts and recognizes our own movements.

私たちの脳は、私たち自身の動きを予測し認識するようにプログラムされています。

It knows where our hands can reach.

私たちの手が届く場所を知っています。

There is no element of surprise or threat, even if touched in vulnerable areas.

たとえ脆弱な分野に触れたとしても、驚きや脅威の要素はありません。

Hence, we can't tickle ourselves.

したがって、私たちは自分自身をくすぐることはできません。

Why is fluoride added to water?

なぜフッ化物は水に加えられるのですか？

To make water taste like soft drink.

柔らかい飲み物のような水の味を作る。

No.

いいえ。

According to a prevailing study.

優勢な研究によると。

When fluoride is added to public water supplies.

公共の水道にフッ化物が添加されるとき。

At an average concentration of about 1 part per million or slightly below, it prevents tooth decay.

百万分の1またはそれ以下の平均濃度で、それは虫歯を防止する。

But how?

しかしどうですか？

Enamel is the hard outer covering of our tooth.

エナメル質は私たちの歯の硬い外皮です。

It is primarily made up of hydroxyapatite.

これは、主にヒドロキシアパタイトでできています。

Hydroxyapatite is a compound of calcium, phosphorus and hydroxide.

ヒドロキシアパタイトは、カルシウム、リン及び水酸化物の化合物である。

Now, when bacteria in our mouth feed on food particles, they produce acid.

今、私たちの口の中の細菌が食物粒子を食べると、それらは酸を生成します。

This acid dissolves the hydroxyapatite leaving behind a residue of calcium and phosphate ions.

この酸は、ヒドロキシアパタイトを溶解し、カルシウムおよびリン酸イオンの残留物を残す。

This results in a tooth decay.

これは虫歯を引き起こす。

Now, when we drink water containing fluoride.

今、我々はフッ化物を含む水を飲むとき。

The fluoride binds with calcium and phosphate ions forming fluorapatite.

フッ化物は、カルシウムおよびリン酸イオンと結合し、フルオロアパタイトを形成する。

As fluorapatite is less susceptible to acid attacks, it helps to stop the tooth decay process.

フルオロアパタイトは酸攻撃の影響を受けにくいので、歯の腐敗過程を止めるのに役立ちます。

For more educational videos please visit http://www.SmartLearningforAll.com

より多くの教育ビデオについては、http：//www.SmartLearningforAll.comをご覧ください。

Also, don't forget to subscribe to our YouTube channel.1 00:00:04,500 --> 00:00:06,000 Smart Learning for All

また、YouTubeチャンネルを購読することを忘れないでください。

Why do mosquitoes bite only some people?

Because they are lazy.

No.

There are a number of reasons why some people are more prone to mosquito bites.

One of them is body odor.

Millions of bacteria which live on our skin produce various gases.

These gases form our body odor.

Some of these body odors attract the mosquitoes.

So, this is the reason why mosquitoes prefer me.

Besides this, a popular research found that.

Mosquitoes tend to bite people with Type O blood nearly twice as often as those with Type A.

Exercising can also entice mosquitoes.

This is because when we exercise, we release more carbon dioxide, heat, and sweat.

Mosquitoes can detect this carbon dioxide and heat.

They can also sense various substances in our sweat such as lactic acid.

Thus making us more likely to get bitten.

Why does hot air balloon float?

Because it has invisible wings.

No.

It is because of density.

Density is the measure of mass present per unit volume.

Lesser the density, lighter will be the object.

Now, density varies with temperature.

It is so complicated.

All right.

I will explain.

When a hot air balloon is on ground, the air inside and outside the balloon is of same temperature and density.

However, when we turn on the burner of the balloon, the air inside the balloon starts getting hot.

The molecules of air move faster and spread apart, taking up more space.

Hence, the air inside the balloon becomes less dense than the air outside.

As less dense air is lighter, the hot air balloon rises and thus, begins to float.

What happens if a plane is struck by lightning?

It will start glowing like a disco ball.

No.

Lightning is a massive flow of charge which carries thousands of volts of electric current.

Thus, it is extremely fatal for living beings and can damage anything that comes in its way.

Yes.

It is really terrifying.

Now many times, airplanes get caught in a heavy lightning storm.

However, airplanes are designed to handle the lightning strikes.

The outer skin of most planes is primarily made of aluminum.

Aluminum is a good conductor of electricity.

When lightning hits the airplane, the electric current travels through the outer skin of the plane.

It does not pass into the plane.

Eventually, it exits off through another extremity, such as tail.

Thus, the airplane and the passengers within remain protected.

Why can't we tickle ourselves?

Because we are lazy.

No.

Areas that are more prone to getting tickled are our vulnerable areas like neck, stomach and armpits.

Yes.

You are right.

Some researchers suggest that laughing on getting tickled by others could be a defense mechanism.

It has evolved over the years when touched suddenly in vulnerable areas.

This laughter could either be a way to laugh out of a tense situation.

To show submission to the person tickling you to stop further tickles.

Now, when we tickle ourselves.

Our brain is programmed in such a way that it predicts and recognizes our own movements.

It knows where our hands can reach.

There is no element of surprise or threat, even if touched in vulnerable areas.

Hence, we can't tickle ourselves.

Why is fluoride added to water?

To make water taste like soft drink.

No.

According to a prevailing study.

When fluoride is added to public water supplies.

At an average concentration of about 1 part per million or slightly below, it prevents tooth decay.

But how?

Enamel is the hard outer covering of our tooth.

It is primarily made up of hydroxyapatite.

Hydroxyapatite is a compound of calcium, phosphorus and hydroxide.

Now, when bacteria in our mouth feed on food particles, they produce acid.

This acid dissolves the hydroxyapatite leaving behind a residue of calcium and phosphate ions.

This results in a tooth decay.

Now, when we drink water containing fluoride.

The fluoride binds with calcium and phosphate ions forming fluorapatite.

As fluorapatite is less susceptible to acid attacks, it helps to stop the tooth decay process.

For more educational videos please visit http://www.SmartLearningforAll.com

Also, don't forget to subscribe to our YouTube channel.