What is an optical illusion and how does it work? Why do we experience the optical illusions? And, why can they be tricky yet fabulous? In this case-lesson we try to apply a systematic approach and effective methods of information analysis in order to understand the optical illusions' nature and mystery.

"Mars needs YOU! In the future, Mars will need all kinds of explorers, farmers, surveyors, and teachers . . . but most of all YOU! Join us on the Journey to Mars as we explore with robots and send humans there one day ..." This is NASA's looking for the passionate enthusiasts who are ready to join its Mars exploration program! Have you heard about Elon Musk's program of Mars colonization? So, let's conduct our own journey to Mars and this case-lesson will help us to do it in a scientific way.

What are black holes? How big are black holes? How do black holes form? Could a black hole destroy our planet? Let's try to find answers for all these and many other questions about this mysterious phenomenon in our case-lesson.

Antigravity is one of the most popular phenomenon in science fiction, but many scientists believe that antigravity isn't possible. Why do authors use gravity devices so often and why do scientists say it cannot be true? Let's try to clarify this and understand what is antigravity in our 7W® case-lesson!

There are billions of solar systems in the Milky Way galaxy and our solar system is just one of them. It is located in an outer spiral arm of the galaxy and consists of the Sun and the eight planets with their natural satellites, asteroids, comets, and other smaller bodies that orbit around them. The more intensive the research we conduct, the more new questions appear for the next generations of scientists and engineers. And this case-lesson can be the first step on your way to solving the astronomical riddles.

Energy is a basis of our life. And the more technologically advanced we are, the more energy we need to support our current and future lifehoods. But, where does energy come from and what do we use it for? Can we become more energy efficient? Let's try to answer these and many other questions in our case-lesson.

Who is the Android? The robot that looks like a human? If it is so, could it have emotions or empathize? This case-lesson can help students to answer these questions and deal with difficult but interesting issues.

The first ever light bulb was introduced about two centuries ago. Today the light bulb is an indispensable element of our life and comfort. Has the bulb changed since that time? What are the types and characteristics of modern light bulbs? And are they still actually bulbs? Let's take an interesting journey to the world of electric lights and illumination!

What do you know about a snowflake? Is it a small piece of snow that falls from the sky or a small "ice beauty" that nature has created? And, do you know about the so called "Koch snowflake"? This case-lesson will help you to form a holistic view about this unique phenomenon.

It is hard to imagine a modern man without a smartphone. This gadget evolves so quickly and absorbs a lot of new scientific and technological ideas, acquiring opportunities and features. That is why the smartphone is our indispensable assistant and "friend". Would you like to understand your "friend" better and to know what technologies are behind its features? So, let's have a look inside the gadget!

Tractors, truck cranes, tow cars, dump trucks, excavators, bulldozers ... They are real "road monsters"! They are big and heavy, and sometimes even awkward. But real professionals can "tame" them and use them as perfect "working tools". These monsters can also inspire people for unbelievable artistic experiments. So, what miracles are they capable of? Let's answer this and many other questions in this case-lesson.

Did you know that the earliest known soap was made by the Babylonians around 2800BC, and this process remained almost unchanged until the late 18th century, when a method of producing large quantities of caustic soda was discovered? So, what else do we know about soap?

This case-lesson can help you to discover a lot of interesting things about mud. Here, we go through such school subjects as chemistry, physics, history, psychology, science, and the basics of health.

This case-lesson will help you to get a holistic view of the unique tectonic and volcanic processes from the point of view of science, gain an understanding of the interrelationship of geological, chemical, physical processes occurring on Earth and other planets.

Everyone loves to solve mysteries! However, if these secrets are "useful", if their solution contains valuable and interesting knowledge in geography, science, history, mathematics – so, such privacy becomes a key not only of fun, but also of development. You can discover these secrets studying the case-lesson. At the same time, you will get many useful skills and competencies!

Life began in the ocean. The ocean gave a possibility for the millions of Earth's plants and animals to inhabit the planet and make it unique in the variety of life's appearances. The ocean gives a lot of wonderful opportunities to humans. But do we take them with care to the ocean? What can we do for the ocean to keep it full of wonders and life? Let's take an amazing journey to the ocean, its secrets and miracles!

Life began in the ocean. The ocean gave a possibility for the millions of Earth's plants and animals to inhabit the planet and make it unique in the variety of life's appearances. The ocean gives a lot of wonderful opportunities to humans. But do we take them with care to the ocean? What can we do for the ocean to keep it full of wonders and life? Let's take an amazing journey to the ocean, its secrets and miracles!

While we are not thirsty, we do not even think about the importance of water in our lives. The human body is largely composed of water, but we rarely appreciate the aquatic environment as "own." What is the difference between the body of water in a glass of water, in rain drops in the river? What water for us is"right"? Why do some scientists call water anomalies?

Water. Its molecule is quite simple in structure (H2O), but its physical and chemical properties are extraordinarily complicated, and they are not typical of most substances found on our planet. A lot of questions to come when we start thinking about the simplicities and complexities of water. And way more answers to come when we start exploring it.

Why are there so many songs about rainbows
And what's on the other side
Rainbows are visions
But only illusions
And rainbows have nothing to hide
("Rainbow connection", The Muppets)
What do we know about rainbows and what is still hidden?

The ancient people believed that these four elements - earth, water, air and fire are the key matters to explain all creation. Fire was meant to be a symbol of initial energy, heat and sun. Not for nothing a story says that fire given to people by the legendary Greek's hero Prometheus, has started civilization, progress and development of humanity.

Some people think that crocodiles descended from dinosaurs. Is it true? The crocodiles are scattered across more than 90 countries. Why is that? There are 23 species of crocodiles. What is the difference between a crocodile and an alligator? Let’s look on the crocodiles "family tree" that traces back to the Mesozoic epo¬ch and discover a lot of interesting knowledge on these extraordinary predators!

This case-lesson will help answer these questions. It will allow you to immerse yourself in the secrets of the underwater world! Let's take a guided tour together with the Mermaid!

All of us saw a lot of pictures showing the beauty and spectacular appearance of bolts of lightning. But, just imagine - about 100 lightning flashes occur each second somewhere around the globe and a lightning flash can heat the air around it to temperatures five times hotter than the sun’s surface!

Can you imagine that ants came about 130 million years ago and now have more than 12,000 species all over the world? Did you know that an ant can lift 20 times its own body weight and can "talk" using chemicals? There are a lot of secrets and interesting facts about the ants. Let's discover them in our case-lesson!

Have you ever thought about being a forester or a huntsman? What do you know about these occupations? Go through this case lesson to know more about it and to get an idea who is "the lord of the forest".

All of us saw a lot of pictures showing the beauty and spectacular appearance of bolts of lightning. But, just imagine - about 100 lightning flashes occur each second somewhere around the globe and a lightning flash can heat the air around it to temperatures five times hotter than the sun’s surface!

There are about 40 species of dolphins swimming the waters of the world. They are part of the family of whales and killer whales, but are actually dolphins. The dolphins are very intelligent and social, living in groups that hunt and even play together. They use many sounds, including clicks, whistles and squeaks. But, is it a kind of a language to communicate with each other? What are they talking about?

Think of wood - how many associations can arise! Trees, a forest, leaves, biosphere, jungles, boreal and mangrove forests, oxygen, fire, paper, furniture, ecology.... Our world cannot live and survive without the woods.

Are all the leaves unique? What can we learn "reading the leaves"? Can the leaves help us in studying languages, math, or inspire our creativity? Get some clue to this in our case-lesson "Leaf Riddles"

Do you know that there are about 5,000 different species of ladybugs in the world! They come in many colors and patterns, although the most familiar is the ladybug with a shiny, red-and-black body. There is a common belief that ladybugs give good luck. So, let's get some luck and some interesting knowledge about these pretty and wonderful beetles!

Many people are afraid of spiders. They seem to be scary and ugly. But, are spiders really terrible? Not at all! In fact, they are extremely interesting! Do you know that spiders are found on every continent except Antarctica? How many species of spider can be found on our planet? Let's discover a lot of exciting knowledge about spiders in our case-lesson.

How much room is needed for the existence of 3,000,000 living beings? Only about one milliliter! Can you imagine that a human body of 80 kg weight contains up to 2.5 kg of microbes! Are they dangerous? Or do they help us?

Sometimes it seems that the modern world, with its scientific achievements, descended from the pages of a fantastic book. After all, those technologies that were considered improbable or impossible, now becoming real, or even commonplace. And genetic engineering, research in biotechnology, genetics, biochemistry are a vivid example of such breakthroughs. That is why the need to learn critical thinking.

Can you grow pearls in your garden? It really sounds ridiculous, but the modern technologies can make it possible in the near future. There is the tremendous variety of pearls, both natural and cultivated. They stand alone among other gemstones and beckon with their origins, history, qualities and beauty. With this case-lesson you will have a fascinating journey to the world of pearls!

Why are bananas berries, but strawberries aren't? Are watermelons a berry? And what fruits are actually berries? Let's go to the interesting world of fruits and find colorful, juicy, delicious answers! Use this case-lesson as a guide on this trip!

Nowadays, you can see a huge number of different kinds of oilson the store shelves. They vary in taste, smell, texture, method of application and use.

Children like fizzy drinks especially in the hottest time of the year. Why? Why does the child not ask parents to buy fruits or fruit juice, but soda? Moreover, this phenomenon is observed all around the world.

How can a person build a business empire, having an idea, the talent and hunger for success? How can you develop these lifelong and not lose energy and faith in yourself? Henry Ford is an example. In this case-lesson you will find out a lot of interesting information about him, his inventions and how these innovations change the industries and the world.

Quest games are extremely popular today? What is the secret if such a popularity? Can we say that the quest games are more that just games? Are there some special winning strategies and can they be developed? Can you create your own guest, and even earn money?

Guess the size of the mountain made by the garbage produced by mankind throughout history! And now think about the fact that the contents of the modern landfills are not only dangerous, but also harm the environment for many years and are dangerous for the humans and nature. Today we sort and process the garbage. But is it enough to stop endangering our planet? How do we solve this problem? What are the keys to such a complex, multifaceted task?

You probably know a lot about Australia. And you can know more about this wonderful continent with this case-lesson! Let's discover whether it is true or not, that: - Australia is the driest of any continent on earth other than Antarctica - There are three times as many sheep than people living in Australia - Australia has a larger population of camels than Egypt - Despite being a massive continent, 90% of Australia's population live on the coast

Sometimes life can be compared to a chessboard where the players play their "own game". Some combinations are good, and the player succeeds. Another player may choose a wrong strategy or tactics and lose the game. So, how do you become a master in chess and use the game strategies in life? This case-lesson will help you to answer this difficult question and understand why chess skills are not just about chess.

How do you call a person who commands, pilots, or serves as a crew member of a spacecraft? An astronaut! And do you know the origin of this word? It comes from two Greek words - «Aster" or «Astron" that means "a star", and "nautis" that means "a sailor". Thus, the word "astronaut" literally means "the one who sails among the stars". Take this case-lesson and find out a lot of interesting information about astronauts and how to become one of them!

Jeans were first designed as workwear for laborers on the farms and mines of America's Western states in the late 19th Century. How have they changed people's lives? How did jeans conquer the world? Why are they the most popular article of clothing? Let's try to answer these questions with our case-lesson "Jeans"!

"Oil war" is happening for decades. What is the reason for it and meaning? What are the possible scenarios? Could there be a winner? Can humanity lose perfect future because of these wars? Is it possible to prevent it? In addition, how? This case-lesson will arm you with the latest knowledge and information for understanding all oil processes, adequate assessment of its value and prospects of using.

Halloween is one of the funniest holidays in the world. It is widely known by its festive traditions, symbols and costumes. Let's get prepared for the celebration and learn about the coolest Halloween party traditions, DIY lifehacks and costumes.

Do you know any other day of the year that is full of legends and myths, like Christmas?! So many dreams, feelings and waiting for miracles are connected with Christmas Eve! Let's discover more about the Christmas history mysteries and legends! This case-lesson helps you to prepare for the celebrations with benefit and pleasure. You get interesting and useful information “bundled” with a good mood.

What is friendship today? How many meanings have the words "like" and "friend" in the twenty-first century? Is there still a room for the traditional friendship and friends in our world? Can animals be friends? Try to discuss and find answers to these and other questions during this case-lesson.

A window to the world, a window of opportunity, a window... How many meanings of the word "window" do you know? Let's discover the world of the windows in this case-lesson! It will be quite interesting!

Although the vaccination has been used for more than a century, the question is still ambiguous. There are many prejudices and myths about it.

What are the glasses for you? A thing that helps you to correct your eyesight or an accessory, that helps you to look fashionable? How then can you select the glasses to have a trendy and useful item that emphasises your individuality?

Chemistry of love. Is it about science or about mystery? Are there special “love agents" in our minds that make us feel love in our hearts? A poet, describing love, would probably say such words as soul, flower, spring, happiness, energy, dream... A scientist, describing love, would definitely mention Dopamine, Norepinephrine, Oxytoxin, Endorphine, Phenylethylamine... Who is right? Can there be only one answer? Let's discover it in the case-lesson "Chemistry of love"!

How does medication work? Why are some drugs freely sold, but others must have doctor's permission to be used? How do we use the medicine drugs to treat, or prevent disease, but not to harm our health? This lesson will help students to understand the information which is extremely important for their health and well-being.

Salt and sugar are well known products for everybody. Although, there are still so many common beliefs, questions, myths and stereotypes about them. Which of them are true and make sense and which are just misbeliefs? Let's try to understand and form our own points of view.

Toothaches are one of the most unpleasant feelings. What are common reasons of tooth pain? How can you get rid of your tooth pain and protect your teeth? Let's answer these questions and know more about our teeth, tooth enamel and oral hygiene that can prevent many types of dental pain. This case-lesson covers such subjects as anatomy and PSHE: It expands and complements them.

More and more people purchase goods using the Internet. A lot of new payment systems emerged in order to make the Internet commerce and transactions easy, convenient and safe. Bitcoin is a decentralized digital currency and a payment system that works without a central bank or administration. But, how does it work? What are ups and downs of the cryptocurrency? Let's answer these questions in our case-lesson "Bitcoin" and find a lot of interesting and useful information about the digital payment systems.

At all times people have always been interested in how they look. They consider their hair as one of the main elements of beauty and attractiveness. People also make a lot of experiments with their hairstyle: modern and unique. But how do you get your hair beautiful and healthy looking? How can you be creative and not harm your hair? How do you get your own unique style? Let’s reveal some secrets of our hair and its nature with this case lesson. We can also get some interesting tips and great ideas on hair styles.

Modern cookery is not about just cooking. But what is it? It is all in one - an art, a science, a talent and a pleasure! Take this unique case-lesson and enjoy it as you do with the most exquisite cuisine!

Why do we change our mood so frequently? Why it is so easy to control our mood? Can we control our mood? This case-lesson helps to learn about how to control our emotions and how to balance our mood.

How often do you laugh? How often do you cry? What may cause you to laugh or to cry? Let's try to discover more about it. How much science is hidden in every tear and every smile: science, history, psychology! Thanks to new knowledge and understanding, your life and your emotions will be more balanced and harmonious.

Every day leaving home and returning back home, people use elevators. Have you ever thought about the meaning of the word "elevator"? And what do we mean speaking about "social elevators"?

There is a master key to every lock in the house or office. But is there a universal key to all knowledge? This case-lesson helps you to find your own "key" and your own answers to these and other questions. Let's find out about a variety of keys to school curriculum subjects and other interesting knowledge!

It is impossible to imagine the modern world without credit cards. They are the main means of payments for goods and services. But is it the only knowledge about the credit cards? Indeed, there is more scientific knowledge and technology about the modern credit cards.