Letter: Ten-minute tricks of the mind

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The Independent Online
Sir: Being constrained by O-level biology, taken in 1950, I am unable to understand why it is that I can never remember 10 minutes later whether or not I have cleaned my teeth, yet am always aware without looking that there remains some undrunk coffee in my mug.

I suspect that this is not an uncommon experience. Can one of your scientifically erudite readers explain?

ALEC JUST

Bushey

Hertfordshire

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