2025-03-31
Can Kalgash Exist? Simulating the Stellar System of Asimov’s Sci-Fi Classic
Simulating Asimov's Nightfall, this study explores Kalgash's six-sun system, its eclipses, and possible stable configurations using Newtonian physics.
Isaac Asimov’s Celestial Puzzle: How Six Suns Shape Kalgash
The most important constraint is that of the red star Dovim. This is the only star visible in that crucial time just before the deadly eclipse. The eclipse lasts for...
How Six Suns and an Eclipse Shaped Sci-Fi’s Greatest Short Story
Nightfall was first written as a short story by Isaac Asimov in 1941 (Asimov, 1941) The story is set in a world with 6 suns which conspire such that at...
Konkurs Young Design 2025
Instytut Wzornictwa Przemysłowego zaprasza młodych projektantów do udziału w kolejnej edycji konkursu Young Design. Tegorocznym hasłem przewodnim jest „Równowaga – dobrostan psychiczny” – temat o szczególnym znaczeniu, zwłaszcza w obliczu...
A Good Story Is the Difference Between Success and Survival
The most successful people aren't necessarily the most skilled, writes John MacIntosh. Storytelling is the bridge between your competence and other people's understanding, he says.
The TechBeat: An AI Ark Could Save Human Knowledge—If We Don’t Screw It Up First (3/31/2025)
How are you, hacker? 🪐Want to know what's trending right now?: The Techbeat by HackerNoon has got you covered with fresh content from our trending stories of the day! Set...
What If There Was a Right Way to Argue Online?
Online arguments aren't about logic. People argue for engagement, enjoyment, or accountability. There are 4 arguer types: Philosopher, Amateur, Troll, Manipulator. Be prepared with sources, emotional control, and disengagement strategies....
The Future Favors the Curious
If you’re a designer in the market for a job right now, you probably feel behind the AI wave already, and you’re wondering if the skills you’ve honed in your...
In defense of ruthless managers
There are two kinds of engineering manager: empathetic and ruthless. I think ruthless managers are underrated for a few reasons. Empathetic managers care. They are emotionally invested in their employees...
AI's "Biggest Test" Is Turning Into a Catastrophe as CoreWeave Flounders
AI is said to have It faced its toughest challenge yet in CoreWeave, the AI processing company that went public on the stock market this week — the first all-AI...
2025-03-30
Ensuring Reliable A/B Test Decisions with Guardrail Metrics
A/B testing decisions must balance Type I and Type II errors. This section explains UI/IU testing principles, Bonferroni corrections, and power adjustments for non-inferiority testing.
How Companies Decide Which Product Changes to Keep or Scrap
Extending A/B test decision rules with deterioration and quality metrics helps catch regressions and ensures experiment integrity. Spotify’s Decision Rule 2 formalizes this approach.
The Four Key Metrics in A/B Testing
A/B testing relies on multiple metrics with distinct roles. Spotify’s framework categorizes them into success, guardrail, deterioration, and quality metrics, ensuring a standardized, risk-aware decision process.
How Spotify Standardizes Multi-Metric Experiment Analysis
A/B testing with multiple outcomes requires structured decision-making. Spotify draws insights from decision theory, OECs, and clinical trials to refine its approach, ensuring reliable, scalable experimentation.
Evaluating A/B Testing Decision Rules with Monte Carlo Simulations
Monte Carlo simulations test multi-metric A/B decision rules, revealing how alpha and power corrections affect error rates, ensuring reliability in statistical experiments.
Balancing Type I and Type II Errors in A/B Testing Decisions
A/B testing decisions rely on statistical error control. This section explores superiority and non-inferiority tests, Bonferroni adjustments, and how multiple-testing corrections shape experiment outcomes.
Spotify’s Secret to Smarter A/B Testing (Hint: It’s Not Just Statistics)
A/B tests drive product decisions, but multiple metrics complicate risk management. Spotify introduces a decision rule framework to refine experimentation, ensuring reliable outcomes while balancing statistical accuracy.
LLMs: An Operator’s View
Many of you that read my articles are operators of some kind. You may run one or many teams, or even a whole company. And, even if you are not...
Lex.Games
My thanks to Lex Friedman for sponsoring this past week at DF to promote Lex.Games, a collection of eight daily word games. Quoting from Friedman’s own description in the sponsored...
Vertu Is Still Selling Phones, Which Suggests Someone Is Still Buying Them
Calfskin for $1,500, flip-foldables for $5,000, and whatever these are for a lot more. Who needs any sense (or a spelling checker) when you’ve got “elesant charisma / heroic essence”?...
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