Introduction -- Inside the Earth -- Digging up discoveries -- Heads -- Gear & gadgets -- Creepy crawlies -- Fact frenzy -- Maps -- Fashion -- Invisibility -- Music -- Special events -- Graves -- Lost to history -- Art -- Dogs -- Fact frenzy -- Spies -- Movies -- Ninja -- Hidden powers -- In the cold -- Too small to see -- Fact frenzy -- Recipes & ingredients -- Vaults -- Treasure -- Heists & thefts -- Technology -- Human body -- Books -- Poisons -- Jewelry -- Symbols & messages -- Jobs -- Fact frenzy -- Camouflage -- Scents -- Food & drink -- Toilets -- Disguises -- Entrances & exits -- Castles -- Games -- Big things -- Fact frenzy -- Government secrets -- Cryptids & mythical creatures -- Spooky -- Underground -- In the city -- Plants -- Transportation -- Abandoned places -- Theme parks -- Mysteries -- Cryptography -- Detectives -- Discoveries -- Fact frenzy -- Inventions -- Volcanoes -- Underwater -- Hotels -- Caves -- Fact frenzy -- Bones -- Landmarks -- In the jungle -- Birds -- Magic -- Cats -- Archaeology -- Fact frenzy -- Lost cities -- In the sand -- Museums -- In the dark -- In the deep -- Exploration -- Robots -- Dinosaurs -- Fact frenzy -- Bacteria -- Rulers & leaders -- Secret rooms & passageways -- Escapes -- Hollow things -- Toys -- Fact frenzy -- Forensics -- Money -- Monsters -- Eyesight -- Extremophiles -- Salt -- To inifinity & beyond.