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The subjunctive tense in Spanish can't be thought of like the other tenses (present continuous, perfect etc). It is used to reflect the mood of the speaker. In English, the subjunctive is not that comm...

The centre of gravity (or centre of mass) of an object is the point through which an object's weight will act through. In other words, the object will always balance around this point.

Olbers' Paradox is a famous problem which baffled many scientists in the early 19th century. 

The German astronomer Olbers (and many of his colleagues) made assumptions that the universe ...

Capacitors are an electrical component made up of two plates with an insulator between them.

Electrons flow onto one of these plates as current flows around the circuit. This gives one of...

Both Comparative and analystic source questions are difficult to approach if you have not been taught exactly how the exam boards like them answered.In my experience, there is a relatively simple process ...