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 Episode 4 of the Bulgarian children’s educational series Tales of Astronomy , titled The Deal , continues the show’s charming tradition of blending fantasy storytelling with real scientific knowledge. In this episode, the magical adventure centers on Mercury, the smallest and innermost planet of the Solar System. Through mystery, supernatural helpers, and the ever-enchanting game Quasar , the story transforms complex astronomical ideas into something vivid, playful, and memorable for young viewers. Like the other episodes in the series, The Deal does not teach astronomy in a dry or textbook-like way. Instead, it wraps science inside a fairytale. Prince Yavor and Princess Kristina do not simply sit and listen to facts. They stumble into the hidden observatory of the witch Titania, encounter magical puzzles, and receive guidance from the spirits of great scientists such as Nicolaus Copernicus and Isaac Newton. In doing so, they learn that every mystery of the universe can become pa...