Brazil has taken a stand against the explosion of "fake news" stories swamping the Internet by making media analysis studies compulsory for schoolchildren.
Around the world, debates proliferate about the problem of unfettered information flooding social media, uploaded by people with no consideration for journalist ethics, impartiality or even the truth. Of particular concern is the effect such misinformation can have on those most impressionable.
"The aim is to teach students to identify fake news, and now it's part of the national curriculum because the country has decided it's necessary," said Leandro Beguoci, editorial director at Brazilian education specialists Nova Escola.
"The proliferation of social media networks have created an urgent situation in this respect," Beguoci said.
At Casa Blanca, teachers Lucilene Varandas and Hildenor Gomes do Santos ensure their students, aged eight to 14, know not to take everything they watch or read at face value.
'Think about clicks'
"When I receive a piece of information, I look for it on the Internet and ask myself if it's true," said Helena Vital, 11, whose parents are teachers. She said the programme has taught her to view the media from a different perspective.
"Now I know that things aren't so bad, the whole country isn't going to collapse," added Vital, who said that consuming news without questioning it "leaves people sad" and that "there are many negative things that aren't true."
The children do not have the tools to systematically check everything, but "they look at the articles, who wrote them, who could be interested in them and where they're published, which are all ways of questioning the information," said Varandas, who is looking to create partnerships with fact-checking agencies to expand the children's education.
The measures seem to be working despite the children's young age.
With a population of almost 208 million people, Brazil has a massive social media presence: 120 million WhatsApp users, more than 100 million people on Facebook and another 50 million signed up to Instagram.
"In the past, kids were taught by their parents, but now that happens through a variety of means, something which alters the role of the school," said Beguoci, a trained journalist.
"What's so interesting in Brazil is that media and technological literacy are considered as important as classical literacy."