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About, On and Over (when talking about topics) Options
Hemant Patel 1
Posted: Monday, August 13, 2018 9:40:00 PM

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What is the key difference between about, on and over when talking about topics?

I went to the library to look for a book about insects.
I'm looking for a book on orchids.
There is still some controversy over the use of the drug.
Posted: Tuesday, August 14, 2018 7:22:53 AM
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Location: Porto Alegre, Rio Grande do Sul, Brazil
On - something technical or more serious ; about - something simple, not so serious . A book on American History. A book about card games.
Posted: Tuesday, August 14, 2018 9:23:02 AM

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It's not a very "black and white" separation - there is no real rule.

However, I agree with peewee that they do tend to be used that way.

A book about American History could be a more general description, whereas a book on American History seems to mean something more detailed (more serious, possibly).

"Over" is used (I think) only for actual disagreement.
I wouldn't even say "a discussion over politics" - I'd say "a discussion about politics".
I would say "a disagreement over politics" or "a controversy over (or about) politics".
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