Load the coin
Change a coin’s bias and separate expected odds from the noise of a finite sample.
Touch the evidence
Seven ways to make uncertainty visible.
These instruments run entirely in your browser. Teaching simulations use replayable seeds; human-input labs transmit and persist nothing.
Plenty Budget Builder
Turn attacker rate, time, parallelism, and margin into a visible Plenty Line.
Keyboard Pattern Tax
See how repetition, keyboard walks, favored keys, and timing reveal structure.
Mouse Correlation Trace
Compare a flood of pointer coordinates with the smaller number of meaningful turns.
Weak Seed Collapse
Watch a wide deterministic output inherit the much smaller search space of its seed.
Source Microscope
Inject bias, correlation, drift, failure, and a balanced-but-known pattern.
Pipeline Bench
Follow uncertainty through sensors, tests, conditioning, a pool, and a DRBG.