How well do you know the back of your hand?

Have you ever wondered where the expression to know something or someone “like the┬áback 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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