CHRONOSCOPE · time, at every scale Home
◌ Workbench
ConceptsThe big ideas, with the evidence — and every lab that shows them The mathsEvery model's equations, constants and worked examples — each checked by the test suite For teachersClass links, completion codes and printable worksheets Your passportTour stamps, missions, your prediction record — and save it to a file Quizzes and reviewTour quizzes, and questions that come back to check what stuck About ChronoscopeWho made it, how it was built, and why you can trust it
Mode
Tour quiz · The puzzle of time

What stuck?

Optional: 7 questions, one from each stop — a few minutes. Trying to remember is what makes it stick, so guess before you look back.

1 · Clock Lab

Why does a moving light clock tick more slowly?

2 · River

In the river picture, what makes the horizon a point of no return?

3 · Spacetime

Two lamps flash at the same moment for you. For someone moving past, they…

4 · Flatland · time as a slice

In the 'block' picture of spacetime, what is 'now'?

5 · Entropy box

Reversing every velocity exactly makes the gas gather back. Why does a real gas never do this?

6 · Two Films

In Two Films, why do two universes with identical starting frames end up different?

7 · Atlas · hole H5

Is 'one time dimension' known to be a law of nature?

New here?