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A Mask for Math

When the effort or resourcefulness of tens of thousands of math tutors in Singapore covers up most local school teachers’ poor teaching pedagogies or methodologies and their low enthusiasm or creativity, thus exonerating the latter in making the subject appear dull and boring and unconnected to real life.
If there was a months-long lockdown in Singapore due to the pandemic, except for the thousands of families who can’t afford private tuition for their children, the math grades of the majority of middle-class students wouldn’t significantly suffer, because of a mask for math culture that has permeated the entire educational system for decades.
A Mask for Math by MathPlus September 12, 2021
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trucker's tan 

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I had a trucker's tan after driving for 10 straight hours on a sunny day.
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British slang for a scientist or technical expert, esp . when the speaker is not certain of the expert’s specific field of study. Not necessarily derogatory, but typically used by persons without a technical background. In the US, the equivalent would be “egghead”, “squint”, or “geek.”

Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.
According to the boffins downstairs, the murderer used a serrated blade.
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Pee Calculus

When you have to pee in a movie but don’t want to miss anything, and must do the following mental equation: will the amount I have to pee cause enough discomfort to diminish my attention capacity for the remainder of the movie to an extent which is greater than the amount of the movie I would miss by making a mad dash to the restroom.
I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.
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Literally "dirty" pronounced with a West Indian accent. Can also have a positive connotation, for example Sean Paul's album title "Dutty Rock".
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or, in a positive usage:

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Ajumma wait a moment
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