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En is a tricky one! This has several meanings, the most common being as follows; it can mean 'in' when referring to a country or a mode of transport, it can mean 'while' or 'by' when used with a present p...

The key to impressing the examiner in any speaking test is showing a good range; make sure you are demonstrating knowledge of the past, present, and future tense. Even if you only show one example of each...

The chain rule is used for functions 'inside' other functions. We have learnt to differentiate functions like x^2, y^20, e^x, -sin(x), and we will use these results in the chain rule. Let's look at an ex...

Binocular depth cues consist solely of stereopsis. This is the name given to the ability of the human brain to combine the slightly different images received from both eyes in order to perceive depth. M...

The lagging strand in DNA replication is the strand of the double-stranded DNA molecule that has to be synthesised discontinuously. This is because the two strands of DNA molecules are antiparallel, so r...