The study, using data from 19,000 children born in the UK in the early 2000s, also found that teenagers experiencing physical punishment in early childhood were markedly more likely to bully siblings and others or engage in cyberbullying.

The effects of smacking appeared most immediately in behaviour problems among infants, while repeated experience of physical punishment at ages three, five and seven was associated with lower literacy.

Link to the study

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[–] Iconoclast@feddit.uk 2 points 11 hours ago

There's some amazing stories of identical twins discovering eachother at later age. I believe the claim there was that it's among the strongest bonds between humans that there is. You've never met before but when you do, it all immediately just clicks.