Timed thinking drills for attention, reasoning, and calibration. Open a module, set your focus, and start a sprint.
Spot the cognitive bias or heuristic in short real-world situations. 188 biases across everyday judgment and research design.
Rational-thinking drills: probability, expected value, Bayes, and a calibration test that measures how well your confidence matches reality.
Mental-math sprint with integers, decimals, fractions, and mixed problems that combine them. Set your own ranges and race the clock.
Coming soon
