I read this yesterday:

‘The front doors of houses always open inwards… Doors on public buildings
often open the other way…’

Why?

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Houses: if the doors have a simple pin-hinge system, that needs to be inside
the house, otherwise burglars could un-pin the door.

Public buildings: to allow for easy exit in an emergency…

Now… confess how long you’ve lived and not known those simple facts :-)!