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The grammatical aspect indicates whether an action is/was completed or not. 

The perfective aspect (as in aorist, aorist infinitives) shows that the action was completed, often that it was a s...

Set f(x) = y. Then rearrange your equation to find x on it's own as some function of y. If you have a x term on both the top and bottom of a fraction then you will have to multiply the whole equation ...

Evolution is a gradual change in the inherited traits of a population over many generations. 

Natural selection is a mechanism where the members of a population best suited to their environmen...

The concept of a mole can be difficult to get your head around.

We are used to giving some numbers names, for example 1 million instead of 1,000,000. And we can use a million as a unit, 3 mill...

While we always capitalise the first letter of all countries and nationalities in written English, the same cannot be said for written French. While in French, countries ar...