After is a preposition of time, usually. "My sister was born after me."
Behind is a preposition (or adverb) of place. "Our house was behind the airport." (preposition); "The children walked behind." (adverb).
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difference between as on and as at
Rational is basically being reasonable, not insane... Rationale is basically a justification for what you are doing or choosing... the reasons behind the decision.
The difference is 2,795.
Directly. Their difference IS the difference between them.
What are difference between scalars and vectors