Tukuk-OSThe Knowledge Complex
Daily facts, riddles, experiments, geography, history, math and tools — free, no account, every day fresh
One place for curiosity: verified facts, real experiments and quick brain training — every section is free, needs no account, and rotates its daily picks on the calendar. For deeper structured learning try the Zero-to-Hero Academy or the NASA Space Complex.
Today, in four cards
📅 Today’s fact
About 95% of the world's earthquakes happen along the edges of the Pacific plate, the ring of fire.
🤔 Riddle of the day
The more you take, the more you leave behind. What are they?
Show answer
Footsteps.
🪺 Experiment of the day
Homemade compass — about 20 min.
Stroke-aligning domains inside the steel turns it into a weak magnet; Earth's magnetic field then torques it around until it lines up.
📜 History moment
44 BC — The Roman Republic dies mid-sentence
Caesar's assassination backfires; within 17 years Octavian becomes Augustus, first Roman emperor, ruling a Mediterranean-wide state.
Eleven ways to explore
Each section below is a full standalone page — read it, play with it, or use it for classroom and family curiosity.