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You see colours due to the length of a wave of light. When a distant galaxy is moving away from us the wavelength increases due to the Doppler Effect (which you may have studied using the sound of a passi...

Step One: Write the first equation and then write the second equation underneath. Label the first equation A and the second equation B. You can now see clearly that each equation contains an x component a...

In French the imperfect tense is most often used when referring to a habitual action in the past, something that you used to do frequently, and to describe something that happened over an extended period ...

The tone symbol (') is used in Greek language to provide an indication of the syllable that should be emphasized the most when reading Greek words. Words that contain only one syllable do not therefore ha...

According to the ending (suffix) of most greek words one can easily tell the gender to which they belong to. Words that end in -η are usually feminine while words that end in -oς are masculine. Lastly, wo...