Paraguay fact of the day
This was from an English-language version of El Pais, tucked into my IHT; I don´t see the story on-line:
Official estimates state that seven out of 10 children in Paraguay are only registered with their mother´s last name — in Mexico the rate is one out of six.
A bit of googling turns up a second and related estimate, namely that in Paraguay 6.5 children out of ten are not registered to receive social services.