History: the story is already written
Strange laws, forgotten inventions, the people behind famous moments. History gives you a hook in every era and never runs out. Example: "Why medieval France put a pig on trial".
Mysteries: suspense as a format
Disappearances, lost places, unexplained events. Mysteries keep people watching because they want the answer, and theories can be told honestly as theories. Example: "The lighthouse keepers who vanished in 1900".
Science: big questions, clear answers
Space, the human body, animals and the strange rules of nature. A good science video answers one question so clearly that viewers share it. Example: "Why octopuses have three hearts".
Psychology: why we do what we do
Habits, memory, decisions and the tricks our brain plays. Viewers watch because they recognise themselves. Example: "Why your brain replays cringe memories at 3 AM".