Greek history in 18 minutes in a effective and fun way. Speed learn about marathons, democracy, the alphabet, Olympics, Gods, Trojan war, Homer. . 
Pro tip:  Go fullscreen, then hit "Quiz" and dive into even more resources. 

Goods are any items that satisfy human needs and wants. They are material items that you can purchase. Anything that you can find in a grocery store, farmer's market, shopping mall, home improvement shop, or any other store is a good. These might include: fruit; vegetables; cell phones; train tickets; coffee from a coffee shop; etc. 

How is trade patterns changing, and why? Globalisation is one of the main accelerators of change globally. Check out this video on globalisation and how it is changing the way of production and trade patterns: 

Have you ever come across the problem of understanding how warm or cold it is when the temperature is given in Fahrenheit or vice versa, if you live in the US, in Celsius? Wouldn’t it be convenient if you could have a machine that would do the conversion for you? This is what functions do: You input something, and it is given as output as something else according to a rule.

Let’s learn the theory about Functions:

Earth has many different climate zones. The atmospheric circulation system creates Earth's climate zones.
We classify the climates according to the maximum and minimum temperatures and the temperature range. We also take into consideration the total and seasonal distribution of precipitation. Check out the different climate zones here:

What events do you think was most important and influential to today's society?
Maybe one of these? Roman empire, Alexander the Great, Greek culture, Pax Romana, Jesus, Muhammed, Genghis Khan, The Black death, The fall of Constantine, The Renaissance, The Gutenburg printing press, Protestant reformation.

European colonialism, American revolution, French revolution, The American civil war, Industrial revolution, The medical revolution,  WW1 and 2, The russian revolution, The great depression, Cold war, Sputnik, JFL assasination, Digital revolution. 

Here is a great video showing you music around the world!

Hint: Checkmark a skill when you know it. Try it now to see your progress in the side menu.