TL:DR: physical punishment does not work, increases behaviour difficulties and causes harm.
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We identified nearly 4k studies from around the world and reviewed the 69 highest quality studies to understand the impact of so-called "normative" physical punishment (spanking, smacking, hitting) which is still legal in many countries.
On this day 30 years ago I was twenty, and a student in East Berlin. I was at a party when we heard the news. Something I thought impossible all my life had happened - the wall was open. /1
We grabbed our beers and went to the checkpoint at the #Tränenpalast (palace of tears) where a big crowd was already waiting to be let through and on the S-Bahn train to West Berlin. And unbelievably, the border guards let us go! /2