Nostalgia

The creator behind Nostalgia goes by Castanhari — his name appears in the channel's commercial contact email. Like many Brazilian educational content creators, he built a channel brand separate from his personal identity, with "Nostalgia" becoming the umbrella name for his entire content universe.

Castanhari has shared that he was bullied as a child because of his nose, which earned him the nickname "ET." He addressed this openly in a personal video, inviting fans to share their own embarrassing childhood nicknames and framing the story as part of broader content about bullying and self-image.

Play9 is one of Brazil's major digital media and talent networks, and Nostalgia's commercial and press contact runs through it. Many of the biggest Portuguese-language YouTube channels in Brazil operate under Play9 for business management and brand partnership coordination.

Nostalgia Ciência is the science-focused series or sub-brand within the Nostalgia channel. Videos under this banner cover topics like NASA missions, astronomical discoveries, and major space events, keeping the same documentary-style presentation the channel is known for.

Nostalgia História is the history-focused arm of the channel, covering events like covered-up nuclear accidents and other lesser-known episodes in world history. It sits alongside Nostalgia Ciência as part of the channel's broader educational entertainment offering.

Castanhari has been publicly vocal about vaccine safety and combating misinformation, regularly using tags like #vacinassaoseguras ("vaccines are safe") and #fakenewsnão ("no fake news"). He also uses transparency hashtags such as #parceriapaga and #postpatrocinado to clearly disclose when content is commercially sponsored.

Yes — Opera, the web browser, sponsored content on the Nostalgia YouTube channel in 2025. It lines up well with the channel's audience, which skews heavily toward tech-comfortable young adult men in Brazil.

Nostalgia produces long-form, documentary and analysis-style videos in Portuguese covering history, science, pop culture, and current events. The format is often described as "edutainment" — educational content packaged with strong storytelling and a conversational tone rather than dry academic delivery.

Yes — Nostalgia is entirely Portuguese-language and the overwhelming majority of its audience is based in Brazil. The channel is one of the largest educational entertainment channels on YouTube in the Portuguese-speaking world.

Nostalgia has surpassed 15 million subscribers on YouTube, placing it firmly in the Mega tier of Brazilian creators. YouTube is by far its dominant platform, where it consistently publishes new videos and maintains strong audience engagement relative to its category.