# Selected skills

2 lessons

Greek history in 18 minutes in a effective and fun way. Marathons, democracy, the alphabet, Olympics, Gods, Trojan, Homer.
Hint: Go fullscreen. Afterwards, click Quiz and explore more resources.

1 lesson

What is light and colours? Light is made up of energy and travels in a straight line in 299 792 km per second. Travelling at the speed of light, you could go around Earth 7.5 times in a second.

1 lesson

How are you affected by fashion? 100 Billion Items of Clothing Are Produced Each Year. The Average Person Only Wears 20% of Their Clothes 80% of the Time. The Target Audience for Fast Fashion Retailers Is Largely Consumers Aged 18 to 24.

2 lessons

Quite often in life, we know some variables, but we must figure out an unknown. For example, we may want to save money for a moped, but to know how long it is going to take, we must be able to calculate it according to our weekly allowance, price of the moped and perhaps other things we are going to end up buying with the money.

Linear equation - A practical example

How long would it take for you to come up with the money if your weekly allowance was 10€, the price of the moped 1550€ and you would buy sweets with 2€ every week? What kind of calculations do you need to make to get the answer? Equations are a way of writing expressions with unknown variables that can be figured out using math. Let’s learn the theory:

1 lesson

With 3 chords you can play hundred songs. With all these chords, you'll be armed with the power to play thousands of different songs. Play them slow one string at the time and adjust your fingers.

1 lesson

Understanding biodiversity

• Biodiversity is a measure that represents the diversity of life, either in a local scale or at a global scale.
• Biodiversity is highly dependent on local conditions, and some regions have a higher biodiversity than others.
• Tropical forests have the highest biodiversity on Earth, representing about 10% of land mass and including about 90% of Earth's biodiversity.
• Selection and evolution can explain the biodiversity we observe (see lesson on evolution here).
• Humans activities are often a threat to biodiversity, and lowered biodiversity can lead to ecological collapse (see humans' impact on nature here).

Ecosystem services

• Healthy, functional ecosystems usually are self-sustained and allow the occurrence of many species.
• Some species, such as crops, pollinating insects or trees are used by humans to produce resources like food or raw materials.
• The benefits that ecosystems give to human societies is called ecosystem services.
• Losing biodiversity usually results in loss of ecosystem services.
• It is however possible to restore biodiversity through actions like planting forests or protecting areas.

3 lessons

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.

2 lessons
Start to find the C, if your melody start on that you can skip all the black keys on the piano. Did you know most melodies consist of notes that is 1 or 2 steps up or down from the previous, so it is a great help when trying to play a melody. So if you can hum a song slowly and listen if it is one note up or down, and 1 or 2 steps, then you can start take out songs by ear.
1 lesson

There are 7 major chords: A, B, C, D, E, F, G. They can all be made a bit more "sad" sounding, e.g. E become Em. Some of the chords is easier to start with, for example Em.