The Little Scientist's Blog

Where does the peace symbol come from?

Where does the peace symbol come from?

How many times have you seen the peace symbol in t-shirts, flags, walls, etcetera? Just seeing it, everybody think of peace, but what that symbol concretely? Who and when was it invented? Today, little scientist, we are going to learn everything about it since today is the International Peace Day!

How many peace symbols are there?

You must have seen lots of peace symbol so far, as the white dove with an olive branch, with Jewish-Christian origins, and the CND (Campaign for Nuclear Disarmament), normally known as the Hippie’s symbol. However, there are many others such as the Pipe of Peace, used by the American Natives in order to establish peace between two tribes; the “Senbazuru” or “The Suit of the one thousand origami cranes” from Japan, whose legend says that a crane will concede a miracle to whom manage to create them, and which became more popular after a little girl made the wish of getting over her illness caused by the radiation of an atomic bomb; the Three-Points-Circle, used by boats as a surrender and peace symbol; and many other ones. Interesting, doesn’t it little scientist?

Peace Symbols

Where do these peace symbols come from?

Although there are an endless number of peace symbols, two of them are the most commonly used: the white dove and the hippie symbol, but…why?

The white dove symbol is one of the most known peace symbols, at least on the European Continent, due to its origins, as these are the two main religions in this continent. We can find its origin in the Bible, but it did not become a peace symbol until 1949, after the Second World War. Pablo Picasso was the developer of its symbol because he painted some paints about it, being one of them the main image for a World Peace Congress in 1949.

Regarding to the CND (Campaign for Nuclear Disarmament) symbol, it was created for a different proposal. Its author, Gerald Holtom, created it as a symbol to represent fight for the disarmament of an industry nuclear armament on the outskirts of London in 1958. However, it soon started becoming popular since the Hippie movement began using it to fight against racism and Vietnam War, turning it into a pacifist symbol. Later, punks and other groups also used it, so now it is a universal peace symbol.


  • The CND symbol was originally created with just a cardboard and to toothpicks.
  • Looking the marine flag’s alphabet, the meaning of the CND symbol is an “N” and “D” overlapped.
  • It is believed that antics Egyptians used a goose as a peace symbol.
  • The word “calumet” (French origins) is also used to refer to the Pipe of Peace.
  • The Three-Points-Circle was established as a peace flag in the Roerich Peace Agreement in 1935.

Now you already know a little bit more about the different peace symbols, but you can still do something else little scientist… use them! Celebrate the International Peace Day forgiving who you are angry with.


Why do some people always wake up grumpy?

Why do some people always wake up grumpy?

Do you also have a friend who is never happy in the morning and you always wonder why do some people always wake up grumpy? If you don’t… maybe you are that person, little scientist! Discover what the reasons are!

What is the Dream’s Inertia?

First of all, we should know what the dream’s inertia is. It is actually the condition that we have when we have just woken up, it means, the time in the morning while we are still “zombies”. It can last between 5 to 20 minutes. However, recent researches show that it can last up to 4 hours to some people!

So we can conclude that the process to wake up is a slow condition that our body cannot accomplish immediately, since it needs time to get used to being awake.

Grumpy in the morning…

So, what are the causes of moodiness in the mornings? There are some different reasons: lack of sleeping hours, or not looking forward to facing the day. Your attitude can change your mood, little scientist!

Of course, we cannot forget the alarm clock… Who doesn’t hate its sound? You should know that it can also provoke bad mood!

Grumpy in the morning

Good morning little scientist!!

How can we avoid it? It is much simpler that you think, little scientist. We can do lot of little, but important, things that will help us to start our days more energetic and happier!

One of the most important things is never skip our breakfast. Some researches have shown that people who normally take breakfast in morning, are happier and full of energy to confront their days, and consequently they aren’t usually grumpy!

Last but not least, we must notice that our position when we are sleeping can strongly affect to our mood. If you wake up pained or you can’t rest properly enough at night, you mightn’t have a good position to sleep. The most recommended position is to lie down faced up. How do you sleep, little scientist?


  • Your morning’s mood and energy can be inherited genetically.
  • What you ate and drank at dinner can also affect to you!
  • Be careful with what you think just before going to sleep, it normally affects!
  • A clue to wake better easier is to keep the curtains opened so that sunlight could illuminate your room, and also it helps to prevent us from going back to bed!
  • It is known that a cup of coffee can improve the mood of some people.

Now you don’t have any excuse to give when you wake up grumpy! Follow our advice and will see how more sprightly you are, which will directly improve your mood. Tell it to your grumpy-morning friends and improve their lives!


Why do we always cry when chopping onion

Why do we always cry when chopping onion?

Have you finally decided to start cooking and you cannot find an answer why you cry when chopping onion, little scientist? It is not because you are sad, sure, but if you want to know the cause, we urge you to keep reading!

Chemical Reactions

Did you know that the scientific name of onion is Allium Cepa? Onion is one of the most cultivated plants around the World as it can be cooked in a lot of different ways: row, boiled, fried, or even caramelized…What do you like the most little scientist?

But let’s explain why we cry… Onions contain propanesulfonic acid, which irritates our eyes. This acid is caused by some chemical reactions which occur when we cut the onion and some enzymes called alliinase enzyme are liberated. This sulfonic gas is volatile and unstable, so that it expands really fast trough the air, which provokes that we cannot avoid it from reaching our eyes.

Why does it make us cry? When that gas is contact with our eye’s gas, it causes a chemical reaction which makes us cry. That reaction creates the sulphuric acid, which irritates our eye’s nerve endings. Then, our brain stimulates the lachrymal glands in order to produce tears which will clean the acid, and we start crying.

They are just crocodile tears

Human body is intelligent, as it manages to perfect our responses to any different stimulus. That is why there are two different types of tears: basal tears and reflex tears. The first ones are mainly used to maintain our eyes wet, while Reflex Tears are responsible for that unexpected reactions, like eyes’ irritation when chopping onion.

Do you want to know a little trick…?

In order to get on well with onions, we can use some to try to avoid crying. Do you want to know it? Pay attention!

  1. Put the onions and knife you are going to use into the fridge around half an hour before using them.
  2. Switch on the extractor.
  3. Moisten your hands, but do not dry them!
  4. Finally, use the sharpest knife you can. Consequently, you will reduce the quantity of enzymes liberated by onions,

Try it and you will see as you will cry less, little scientist!


  • Onion also stimulates hair growth.
  • Onion’s skill tea is one of the most recommendable teas when we are hoarse.

There are many ways to cook an onion, but the worst one is, for sure: chopping. We always take the knife as we would have won any battle, think that we are so hard, promising ourselves that we do not cry, but we should realise that it is not on our know, but on the alliinase.


The creatures with which we live but we don’t know about

The creatures with which we live but we don’t know about

We usually believe that we already know everything in the World, but are you sure little scientist? Sometimes we find ourselves shocked due to some news where appear really strange animals which nobody exactly knows who they are. If you want to discover some of the strangest creatures which we live with but we don’t know… keep reading!

What we mean with “creatures”?

First, we should know that there is not a specific number of different animals that exist in our world, but it is estimated between to be between 3 and 30 million of species! Moreover, around 20.000 new species are discovered every year, so, do you still think we know all of them?

That is the reason why we get shocked lots of times with some rare animals which are not usually seen. However, there are some which are even so stranger that seem to be a myth. These are called “creatures”, as nobody knows how to call them when they are seen.

What creatures have been discovered recently?

During last days, a photo of a really uncommon animal has been shared on Twitter by Preeti Desai of the National Audobon Society. This animal seems to be unknown since nobody knows what it is, even though it seems to be extraterrestrial due to its appearance with no eyes, a mouth of razor-sharp teeth and a large cylinder-shaped body.

Strange creature after Hurricane Harvey

After some guessing, the strongest scientist’s opinion is that it might be a fang tooth snake-eel, also known as the tusky eel, which is native to the Gulf of Mexico. Furthermore, there are other theories, as it could also be a in another eel family - either the garden or conger eels. Do you have any other idea little scientists?

More creatures…

There are lots of animals we don’t know yet, and one of the proofs is the “creatures” that are found every some years. For example, in 2011 a mystery creature washed up on a Japanese beach. Nobody knew what it was, since it had the shape of a small whale but, when they were closer, they realised it actually had a surface resembling rocks. What it was? Some scientists propounded the theory that it wasn’t an animal, while others upheld that it was some kind of deep-sea-animal.

Apart from that, in 2015 another completely uncommon fish was spotted in an island of California. The fish was extremely thin and long (17 feet), and nobody could give an answer of what they were seeing.


Finally, after some discussion, some scientists discovered that it was an oarfish, a kind of extremely rare fish who live into the deep sea. This kind of fish is so uncommon that are seen once each so much years that not many people remember it when they see it again! The main fact why is too difficult to see them is that they live, at least, 300 feet below the water surface.


  • It seems is not strange finding these kind of creatures after catastrophes, since the two first have been found just after the Hurricane Harvey (the “eel”) and the Tsunami in Japan (the “whale-rock shaped”).
  • Oarfish are also known as “earthquake predictors” because, in recent years, some of them have appeared in some places just few days an earthquake shook it.
  • It is believed that less than the 20% of the World’s species have been recorded by scientists.
  • Oarfish are the longest bony fish in the world, and they don’t have scales.

You have already learnt about some weird animals that can be found in our world! So you can start looking into that creatures and start becoming a biologist who discovers new species! If you want to search, don’t forget tell us what other creatures you fin!


How much do clouds weigh?

How much do clouds weigh?

Have you ever wondered how much clouds weigh? Would they be light like cotton or incredibly heavy like elephants? Today you can discover every secret inside them! Keep reading to find them out!

What are clouds made by?

Firstly, we should know what cloud are made by as well as how they are formed, don’t you think little scientist?

Clouds are formed by drops of water and tiny ice crystals that are in the atmosphere. The sky is usually filled with water, although we cannot perceive it since those particles are so minuscule that are imperceptible for human’s eyes. Those drops can be transformed into water steam so that clouds are created!

How clouds are made


When we lay down to look at the sky to observe calmly those “cotton sheet” floating through the sky, first thing we might do is start imagining… and we then realise that some clouds have specific shapes! (or that is what we think) However, if we looked through into them, they could tell us much more things than that!

As it has already been explained, clouds can be made by drops of water and/or ice crystals. It depends on their height respectively to atmosphere. It means that if they are over atmosphere (more than 6 km from the floor), these will be constituted by ice, while they will be made by water if they are below that height.

But, how much do they weigh?

As some clouds are made by ice, it is normal thinking that they might be the heaviest ones, but, what exactly is their weight? Well, these “soft cotton sheets” made by ice can weigh up to the weight of 200 thousand elephants!! Shocking, don’t you think little scientist? Even normal white clouds like the ones we can see every day, can weigh up to 5 tons, which means the same as 100 elephants!

And how is rain formed?

After all of this, a doubt has come up to our mind… if clouds are made by water and ice, why don’t rain every time there are clouds in the sky?

It is simpler than it looks like, little scientist. Normally, clouds are less dense than air, so it keeps them floating. However, when clouds’ density starts increasing, their weight also increases, so the drops inside them begin to fall. It starts raining.


  • There are different types of clouds. There are called after its shape or the place where they are.
  • Clouds reflex heat from the Earth at night, keeping the ground hot.
  • Clouds investigations are essential to understand the climate of a planet.
  • NASA has some satellite in the space whose main purpose is to study clouds.
  • Clouds in Jupiter are made by a gas called amonia.
  • Mars has clouds completely similar to the ones on the Earth, made by water.

Now you already know every about clouds, little scientist. Go out and observe them! You will realise much more thing than you used to. And, don’t forget telling it your friends, they will be so shocked as you when they will know all about clouds!


Do you know what is the most intelligent animal in the World?

Do you know what is the most intelligent animal in the World?

Have you ever wondered what is the most intelligent animal in the World, little scientist? Everyone think that dolphin, or elephant, is the most intelligent, but…. What if they aren’t? Find out here which animal is more intelligent than any other!

So, what is the most intelligent animal in the World?

Actually, there is not an agreement between scientists about this topic, since, as you might already know, humans are offspring of monkey, so there are other primates (orangutan, gorilla, chimpanzees, etc…) whose intelligence is also high. However, there are other animals that are really intelligent, little scientist!


Primates - Intelligent Animals

Regarding to different tests and experiments, it was discovered that some primates had a really high intelligence. In fact, they have an excellent communication, an amazing memory, the ability to adapt to their environment, and they can even learn how to use some tools! But the most astonishing result was finding out that some orangutans got to create cape for rain after being put back into nature!


Pig - Intelligent Animals

Are you surprised, little scientist? That’s it! Pigs are one of the most intelligent animals in the World. Certainly, some research shows that pigs can be as intelligent as a 3 years old baby! It means that they can be even more intelligent than cats and dogs… Apart from that, they also use an specific language to communicate to each other, with up to 20 different sounds.


Dolphin - Intelligent Animals

It is known that dolphins are one of the most intelligent animals in nature, apart of being one of the most loved… Coming back to intelligence terms, it has been shown that they use a specific language to communicate, although it hasn’t been decoded yet. Moreover, they can also show their feelings! However, what is probably the most shocking capacity of these cetaceous, is that only half of their brain sleeps, while the another middle is still awake and aware of potential dangers.


Octopus - Intelligent Animals

They are the most intelligent invertebrate! We all know their fantastic abilities to escape from their enemies, being able to detect them lot of time before they arrive. In addition, they are capable of changing their appearance to escape from predators, since they learn habits and behaviour of old octopus since they are born.


Elephant - Intelligent Animals

Of course elephants have to be in this list! These majestic animals, offspring from prehistorical mammoths, are extremely empathetic, and establish hierarchies when they are in a group. But it is not their only abilities, as they are able to use tools to find food, identify and imitate sounds, and even show their feelings! Finally, it is also known that these pachyderms have a prodigious memory and they can remember individually each of the members of their group as well as some really large ways!


  • Primates’ DNA has some similar sequences with the human’s DNA.
  • Elephants make funeral rituals and sometimes they visit their relative’s tombs.
  • Pigs are really scrupulous, since they keep their bathroom far from the zone where they usually live in.
  • Pigs and elephants are capable of understand how miracles work.
  • An octopus can open a jar and tighten a screw.
  • Female elephants can identify which plants induce to birth.

Did you already guess some of them, or you are completely surprised? Surely you will not ever look at them in the same way! Tell us what other animals yoy think that are as intelligent as these ones!


Why do we swing our arms while we are walking?

Why do we swing our arms while we are walking?

Today we are going to share with you a question we have talking about last day, little scientist, why do we swing our arms while we are walking? You might have already noticed that we always swing them unwittingly, but do you want to know why? Keep reading to find it out!

Why do we move our arms…

We noticed that there has been lot of theories about it, but none of them seems to be completely right. That is the reason why a group of researchers of the University of Michigan decided to carry some research to find it out. They thought that the best could be making some experiments in order to evaluate every single aspect of our way of walk.

Move arms an walking

The experiment…

Those researchers decided to study how ten random people walked. These are the results they obtained:

  • There are some people who walk swinging their arms like the majority of us.
  • But there were also some people who did not do that. Their arms did not move anything.

Then, they also decided to make some mechanics tests to find out the hidden mystery. However, the solution was more obvious and simpler than they had thought! We move our arms to save energy, little scientist! They discovered that moving our arms while walking implies a significant save of energy to our body!

The conclusion…

You may be wondering how we can save energy by moving our arms. Certainly, our arms’ movement help allow our muscles to work less, since they do not have to work to make our arms swing.

This is a completely natural movement, but if we wanted to keep them quiet, our muscles would be in tension, so they would be spending energy… The main reason of that fact is that we would be interfering between a natural movement, so we would be wasting some energy that we do not if we allow them to swing.

To conclude, during every daily walk, we could fall and be injured because of a loose balance. However, if we swing our arms, we are keeping our balance unconsciously. Consequently, our legs’ muscles are more relaxed since they do not have to work to maintain it, and they can save energy.

Some curiosities:

  • If we kept our arms up, we would spend a 12% more of energy than usual. It means walking a 20% quicker or taking a 10kg backpack!
  • If we swung our arms synchronized with our legs, we would be spending more energy!
  • Moreover, if we do not allow our arms to swing free, it could injury us on our back

Now you can look at people to see if they swing their arms, and it they do not… help them saving energy! Keep paying attention to our blog to find more scientific tips and facts, and, if you think it is interesting…share it with your friends!


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