Browse skills per subject or grade. Click skills for quiz and more lessons

How fast can you greenmark all skills in a subject?

Recent activity by Nelli Numminen

Lesson created In 10-12


  • Meaning of the word is literally "rule by the people" and it comes from Greek language
  • Democracy is a form of government in which supreme power is vested in the people and they can exercise it both directly and indirectly
      • Pure democracy
      • The public participates in government directly, there is no intermediary in the decisions 
      • Democracy thru representatives
      • Developed during the Middle Ages and the Enlightenment
      • Nearly all modern Western-style democracies function as some type of representative democracy
      • The power of the representatives is usually curtailed by the constitution or other measures


  • Universal suffrage 
  • Competition for office 
  • Freedom of speech and the press
  • The rule of law 

After reading watch this video by Knowledgia and learn more about democracy

Lesson created In 7-9


  • Social media has become a big part of our everyday life 
    • It can be either beneficial or harmful, depending on how you use it
  • Social media creates opportunities to:
    • Keep in touch with friends and family
    • Network and find different career opportunities 
    • Connect with people around the world who has the same interests
    • Share your own thoughts and feelings about life 


  • Everything that you post will stay on the internet forever even though you might delete it by yourself
    • Always think twice before posting a picture or an opinion on some matter because it might end up somewhere else than where you initially posted it
  • Take time to go thru and read the terms of agreement so that you know what you are signing up for
  • Respect other people's privacy and don't post any pictures without their consent 
  • Use privacy settings and only accept contacts that you know 
  • It is against the law to hack, steal or illegally download other people's pictures or property online
  • One of the most important rules on social media is to take responsibility on your own actions and words
    • Online bullying is a real issue that can harm other people and even lead to a police investigation 

Watch this video by watchwellcast and take notes on how to use social media/the internet safely! 

Lesson created In 10-12


  • Define your topic and consider it from many different aspects
  • Try to consider the main keywords and central concept of your idea 
  • Learn how to use different search services 
  • Combine your keywords by commands AND, OR & NOT and use capital letters when doing this


  • An essential part of any research is to critically evaluate the information that is found
  • Focus on these things when searching information: 
    • Relevance; Is this site relevant for my needs?
    • Accuracy; When was the information on the site updated, where can I check the accuracy?
    • Perspective; Is this only one side of the issue or are there multiple perspectives provided?
    • Reliability; Who created this information, what is his/her expertise?


  • Decide what sources you want to use: 
    • Primary sources:
      • Original materials that provide direct information on the subject
      • Contemporary sources that were created when the event happened (newspaper articles)
      • Primary sources may be published or unpublished 
    • Secondary sources:
      • Interpret and discuss the evidence provided by the primary sources
      • Secondary sources are usually second-hand knowledge or observation
    • Tertiary sources:
      • Books or articles that summarize the information from primary and secondary sources
      • Provides background knowledge on the topic
  • It is important to evaluate, compare and combine information from different sources so that the sources are suitable for your own work and the topic that you have chosen 

Five tips on how to improve your critical thinking by TED-Ed 

Lesson created In 7-9


  • Convention on the Rights of a Child is made by the United Nations and it includes all the children under the age of 18
  • The Convention has 54 articles that explain the rights of the children 
  • The Convention has four basic principles: 
    • No discrimination 
    • Paying attention for the benefit of the children
    • The right to live and to evolve 
    • Respecting the views of a child 
  • The Convention on the Rights of a Child is the most ratified human rights treaty
    • It was ratified in 1989


Article 1:

  • For the purposes of the present Convention, a child means every human being below the age of eighteen years unless under the law applicable to the child, majority is attained earlier.

Article 3:

  1. In all actions concerning children, whether undertaken by public or private social welfare institutions, courts of law, administrative authorities or legislative bodies, the best interests of the child shall be primary consideration.
  2. States Parties undertake to ensure the child such protection and care as is necessary for his or her well-being, taking into account the rights and duties of his or her parents, legal guardians, or other individuals legally responsible for him or her, and to this end shall take all appropriate legislative and administrative measures.
  3. States Parties shall ensure that the institutions, services and facilities responsible for the care or protection of children shall conform with the standards established by competent authorities, particularly in the areas of safety, health, in the number and suitability of their staff, as well as competent supervision.

Article 6:

  1. States Parties recognize that every child has the inherent right to life 
  2. States Parties shall ensure to the maximum extent possible the survival and development of the child 

Article 33:

  • States Parties shall take all appropriate measures, including legislative, administrative, social and educational measures, to protect children from the illicit use of narcotic drugs and psychotropic substances as defined in the relevant international treaties, and to prevent the use of children in the illicit production and trafficking of such substances. 

Article 39:

  • States Parties shall take all appropriate measures to promote physical and psychological recovery and social reintegration of a child victim of: any form of neglect, exploitation, or abuse; torture or any other form of cruel, inhuman or degrading treatment or punishment; or armed conflicts. Such recovery and reintegration shall take place in an environment which fosters the health, self-respect and dignity of the child. 

Watch this video by acyoNSW and learn more about your rights as a child! 

Lesson created In 4-6


  • Family has a huge impact on our wellbeing, especially when we are at a young age 
  • Having a close relationship with your parents and the fact that they are interested in your personal life and overall wellbeing are factors that protect you later on in life 
  • Typically we think that a family is a set of parents and their children
    • Family can also be a one-person household or a household that has many different generations living together
  • The definition of a family depends on who you ask 
    • Check out this video by AIFStv and learn different ways to define your family 
  • Families can be defined to:
    • Nuclear families
    • Stepfamilies
    • Single-parent families
    • Adoptive families
    • Same sex families

What family types we have?

By Wallace Fernando 

Lesson created In 10-12


  • The Antiquity is also known as the Ancient Era
    • It started about 3000 BC and lasted approximately to the mid 400 CE
  • Watch these the three videos (all by: National Geographic) below and learn about the important civilizations the Ancient Era




Lesson created In 10-12


  • Industrial revolution marks the period of development that transformed rural societies into industrialized, urban ones
  • Goods that had been previously crafted by hand started to be produced in mass quantities by machines in factories 
  • Steam power was the "game-changing" invention that started the Industrial Revolution from Britain


  • From the late 19th to early 20th century cities began to grow 
  • Rapid advances such as creation of steel, chemicals and electricity helped to mass produce consumer goods and weapons 
  • People started to move around with trains, cars and bicycles 
  • News spread via papers, radio and telegraph 
  • Industrial growth created wealthy entrepreneurs and comfortable middle class supported by workers who were mainly immigrants 

By Simple History

What do you think was the most important invention during Industrial Revolution?

lesson edited In 7-9


  • United Nations is an international organization that was founded in 1945
  • It was founded because the world wanted and needed peace after World War II
  • It took approximately two months to first draft and sign the UN Charter, which created the United Nations
    • The main goal was to prevent another world war
  • Four months after the first conference, the United Nations officially began (24.10.1945)
  • When it was first founded it had 50 member states, today the number of member states is 193
    • All of these member states have agreed to climate action in order to limit global warming

Main goals for the United Nations:

  • Maintain peace and security
  • Give humanitarian assistance 
  • Protect human rights
  • Uphold international laws 
  • Achieve a more sustainable future

The main parts of the United Nations are:

  • The General Assembly
  • The Security Council 
  • The Economic and Social Council
  • The Trusteeship Council
  • The International Court of Justice
  • The UN Secretariat 

Watch this informative video by RMIT University and learn even more! 

Lesson created In 10-12


Background information:

  • Human migration is the movement of people from one place to another
  • The patterns of movement reflect the current conditions of the world and the cultural landscapes
  • The first migrants were ancient humans who originated in Africa and spread to Eurasia 
    • Most likely these migrants were driven by climate and food factors

Types of human migration:

  • Internal migration: moving within a country or a city
  • External migration: moving to a different country or continent 
  • Emigration: leaving one country so that you can move to another one
  • Immigration: moving into a new country
  • Return migration: moving back to where you moved from originally
  • Seasonal migration: moving to another place because of climate conditions or labor response

Reasons for migration:

  • Lack of basic necessities 
  • War & terrorism 
  • Human rights violations
  • Nature disasters 
  • State of the economy
  • People can also move to another place because of a better climate or more work opportunities 

Check out this video by CrashCourse to find out more! 

Lesson created In 7-9
  • Revolution is a major and sudden + typically violent alteration in government and in related associations and the structures 
    • Revolutions start when the social climate in a country changes and the political system reacts in a threatening way
  • Aristotle linked the idea of revolutions to many different causes but largely to the desire for social change 
  • Throughout the Middle Ages the countries in Europe did what they could to prevent revolutions and preserve order
    • In the medieval times church maintained the authority 
    • Sometime during the Renaissance however, the concept of revolution changed 
      • People began to believe in change and that it is necessary for the society to progress
  • Greatest revolutions of history are American, English, French, Chinese and Russian revolutions. These didn't only change the system of government but also economic system, social structure and cultural values

Check this informative video by National Geographic and get the most important facts about revolutions!

WHAT IS THE MAIN AIM OF A REVOLUTION? What do the people want to change?

Lesson created In 10-12


Physical activity refers to all movement that is done to improve your health. Both moderate- and vigorous-intensity physical activity can improve one's health. Popular ways to be active are for example walking, cycling and doing sports.


  • Prevents and manages many diseases such as cardiovascular diseases, cancer and diabetes
  • Reduces symptoms of depression and anxiety
  • Enhances thinking, learning and judgement skills
  • Improves overall well-being
  • Helps you control your weight


  • Physical activity releases chemicals like endorphins and serotonin that improve your overall mood
  • Physical activity reduces stress, depression and anxiety and it can also help you recover from mental health issues
  • It improves your sleep


Thanks to Practical Wisdom – Interesting Ideas

So what did you learn about physical activity?

Name the five most important benefits of physical activity in your opinion

lesson edited In 7-9

Health is a state of complete mental, physical and social well-being. It is a resource for our everyday life. Health is a positive concept emphasizing social and personal resources as well as our physical capacities. 

How EXERCISE affects your health?

Exercise has many positive impacts to our physical, mental and social health

  • It helps us to sleep better
  • Makes us enjoy life more and prevents depression
  • Helps us to remember and solve problems
  • Exercise has a big part in preventing and treating diseases such as many cancers and type 2 diabetes 
  • Has a very positive impact on our overall health

How does the RIGHT DIET affect your health?

  • The right kind of diet helps us to keep going and adds our wellbeing
  • Healthy food is tasty, colorful, versatile and has a lot of vitamins in it
  • It is important to eat regularly, it helps you to avoid unhealthy fast food
  • Good food = good mood 

Watch this video about overall health by St. Luke's University Health Network

Things to remember on correct working position:

  • Keep you head leveled, facing forward, and in-line with the torso
  • Shoulders should be relaxed 
  • Back is fully supported with appropriate lumbar support
  • Feet are firmly on the floor or in a footrest

Answer this:

How can you support your overall health with exercise and a healthy diet?

Lesson created In 7-9

REASONS for climate change                                      

Human activity such as: 

  • Increased use of fossil fuels (oil, coal and gas)
  • Increasingly intensive agriculture which emits greenhouse gases
    • Carbon dioxide is the main cause of human-inducted climate change
  • Deforestation 

Natural causes: 

  • Volcanic activity 
  • Solar output
  • Earth's orbit around the sun

CONSECUENCES of climate change

  • Fresh water shortages
  • Ice is melting which contributes to sea-level rise
    • Number of floods will increase
  • Storms and heatwaves
  • Temperature changes are also affecting wildlife and other species as well

It's hard to say how greatly will the climate change in the future which makes it hard to evaluate the true consequences. 

Climate change in a nutshell

Thanks to National Geographic 

Read the text and watch the video then think about this question: 

What can YOU do about climate change?

Lesson created In 7-9


What caused World War 1

- Nationalism

- Changes to the power structure of Europe

- Arms race

- Alliance system

- Regional tension

- Imperial ambitions

What were the consequences of World War 1

- Map of Europe was reconstructed

- Different treaties -> treaty of Versailles was the most significant one

- Creation of League of Nation and Paris peace conference

     Europe before the war                                          Europe after the war

Look at this short video of World War 1 to see the different phases of the war

Thanks to Geo History


What caused World War 2

- Failure of World War 1 peace settlements

- Global economic depression

- Weakness of the League of Nations 

- Militaristic and nationalist leaders in Germany, Italy and Japan

What were the consequences of World War 2

- Soviet Union started to dominate eastern Europe 

- Germany was divided among allies -> eventually led to the formation of East & West Germany

- USA and Soviet Union became "super nations" 

- Nationalism became a dominant force throughout the world 

Look at this video of World War 2 to see the different phases of the war 

Thanks to Geo History

What did you learn?

Name two causes and two consequences from both wars

Lesson created In 7-9

Links for the videos:

What would happen if you wouldn't sleep? By: Colossal Cranium 

How food affects your brain? By: TED-Ed 

What happens in our body when we exercise? By: British Heart Foundation 

Importance of social connections By: Whats Up Dude 

How addiction affects your brain? By: Dana Foundation 

448 skills

634 lessons


104k actions

Structured top content for the top ten skills.

Click the skill title to see all lessons and a quiz. Complete a skill with a quiz or checkmark it manually.

Gain knowledge and earn badges in just 10 minutes a day, delivered straight to your inbox. Get started

Looking for more support? Sign up for a 10 week online course with one session every week DISCOUNT
Get "5 pay for 1" family discount, or ask for school discount here.


Palo Alto, San Francisco, USA
Finland - Sweden - Belgium - South Africa



Get a skill overview poster and see all skills.
Scan a subject qrcode with your phone and get directly to that subject.
As a customer, just contact us for delivery.