How well do you know the back of your hand?

Have you ever wondered where the expression to know something or someone “like theĀ back of your hand” comes from? Despite not knowing its origins I have recently learnt that in several studies that have been conducted only 5% of people are able to recognise their own hands (“Definitive Book of Body Language” by Allan & Barbara Pease). So where is the discrepancy? Have we been conditioned...

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