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Guided tour 1 · 7 stops · about 20 minutes

🧩 The puzzle of time

If you want the big question: why is there one time, and only one? From 'do clocks agree?' to 'is it a law of nature?'

  1. Do two perfect clocks agree?Two perfect clocks — and a surprise when one of them moves.Clock Lab →
  2. Does gravity change time too?A black hole drawn as space flowing inward. Can light swim out?The River →
  3. Is there one 'now' for everyone?Two lamps flash together — or do they?Spacetime →
  4. So what is 'now'?A whole history stacked into one block.Flatland →
  5. Why does time only run one way?A gas spreads out. Can you make it gather back?Entropy box →
  6. What would two times do?Two identical starting frames. Watch what happens next.Two Films →
  7. Is one time dimension a law of nature?Everyone who has tried to answer it — and how far they got.The Atlas →

Each stop asks you to predict before you explore, so the answers aren't listed here.

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