Through out the year you might get different grades in school. Some grades could be excellent some not so good. At the end of the semester you might want to calculate your average grade. How can you do this? If we would like to find a middle between two number values le'ts say 5 and 3 all we need to do is to find mean or average. In order to do that we should add up the numbers and devide the sum with 2. (5 + 3) ÷ 2 = 8 ÷ 2 = 4 Now 4 is exactly between 5 and 3 and it is the average value, of the two numbers, equally distant from both. Finding an average of 5 and 3 was easy, you could do it even without calculation, but what if you want to calculate of average of more than two numbers? Well in the first example we added up the numbers and divied the sum with two and two is the amount of number values we added. This means if we would like to find an average for more than two numbers we would also have to add them up and devide the sum but with the value equal to the how many numbers we added. As an example we can find the average of 17,11,8. (17 + 11 + 8) ÷ 3 = 36 ÷ 3 = 12 So we first added up the numbers and because we added three numbers, we devided the sum with three and we got an average or a mean of twelve. Twelve is not equally distant from all three numbers, but if we would share the sum of all numbers equally this is the number we get which makes it kind of the "central" value for these numbers. No matter how many values we have if we want to find the mean value we only need to add them all and devide the summ with a number equal to how many values we added. To find out more you can check out these interesting videos that do more examples on average values. This interestig video shows the practicall application of calculating and understanding average:

Beginner Tutorial how to use Photoshop in 5 minutes

Design Process for ANYTHING

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.

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:

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