Lab activity · Replay
Can you prove what happened?
A small physics table runs for twelve seconds. Click above the table to drop discs. When the run ends, the only things recorded are the starting seed and your drops. Replay from that record and check whether the simulation lands in exactly the same final state, down to a fingerprint of every position.
Why this matters
If a system can be replayed from its inputs, its results can be checked by someone else instead of taken on trust. The same idea underpins audit trails for automated decisions.
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Simulation core from Maverick's replayable simulation framework. A physics demonstration only: there is nothing to win or lose. Physics by Rapier (Dimforge), Apache License 2.0.