The Spacing Effect: Why Cramming Fails and Spaced Practice Wins
The spacing effect explained through Ebbinghaus's original work, the Cepeda meta-analysis, and Bjork's desirable difficulties, with a practical guide to spaced study.
Source-backed guides for clearer thinking
An independent knowledge library for people who want to understand ideas properly, not skim another shallow article. In-depth guides on concepts, decision-making, learning, technology, work, and culture, each built to explain the mechanism, name the sources, and stay useful long after the news cycle moves on.
Productivity Evidence Map: What the Research Actually Supports
Common productivity claims rated by how strong the research behind them really is. Robust principles - the cost of task-switching, specific goals, and if-then plans - separated from popular-but-unproven tactics like the 'optimal' Pomodoro ratio or the single 'best' system, with what to actually do about it.
Cognitive Bias Evidence Map: Robust vs. Failed-to-Replicate Biases
An evidence map of well-known cognitive biases rated by how well they replicate - separating robust findings (anchoring, framing, confirmation bias) from contested ones (ego depletion, social priming).
Featured
Goodhart's Law: When a Measure Becomes a Target
Goodhart's Law explained through its origin in monetary policy, Strathern's famous phrasing, the four flavors of Goodhart, surrogation, reward hacking, and how to defend against it.
Learning Science Evidence Map: What the Research Actually Shows
AI for Knowledge Work: Practical Workflows, Prompts, and Limits
Better Decisions Under Uncertainty: A Practical Guide and Toolkit
AI Source Trust Checklist: 10 Checks Before You Trust an AI Answer
Understanding Deep Work and Shallow Work Concepts
Identifying Toxic Workplace Signs and Responses
Why When Notes Fly feels different
Most online content is built to be found quickly and forgotten quickly. When Notes Fly is built for the opposite. Each guide takes one subject and explains it with structure: what it means, how it works, where the evidence comes from, what people misunderstand, and how the idea applies in real life. We name sources, show the limits, avoid filler, and update guides when the evidence changes.
The result is a knowledge library you can return to, not a feed you scroll past.
concepts
Goodhart's Law: When a Measure Becomes a Target
Goodhart's Law explained through its origin in monetary policy, Strathern's famous phrasing, the four flavors of Goodhart, surrogation, reward hacking, and how to defend against it.
Concepts
The Spacing Effect: Why Cramming Fails and Spaced Practice Wins
The spacing effect explained through Ebbinghaus's original work, the Cepeda meta-analysis, and Bjork's desirable difficulties, with a practical guide to spaced study.
Cognitive Bias Evidence Map: Robust vs. Failed-to-Replicate Biases
An evidence map of well-known cognitive biases rated by how well they replicate - separating robust findings (anchoring, framing, confirmation bias) from contested ones (ego depletion, social priming).
Learning Science Evidence Map: What the Research Actually Shows
A sourced evidence map of core learning-science findings: each technique rated by evidence strength and effect type, with every claim linked to a named peer-reviewed study.
Explainers
The Simulation Hypothesis: Analyzing Reality's Nature
Nick Bostrom's simulation argument explained: the trilemma, the physics objections, the consciousness problem, and what it would mean if our...
What Is the Opioid Crisis? Analyzing Its Causes and Effects
The opioid crisis killed over 500,000 Americans between 1999 and 2019. Understand the three waves, the neuroscience of addiction, Purdue Pharma's...
The Obesity Epidemic: Biology and Environment Explained
US obesity tripled in four decades, reaching 42% by 2020. Explore the biology of why energy regulation fails, the role of the food environment,...
explainers
The Welfare State: Its Origins and Impact Today
A thorough guide to the welfare state — its Bismarckian origins, Esping-Andersen's three worlds typology, the Beveridge Report, Nordic...
ideas
Understanding Habit Stacking for Lasting Routines
Habit stacking explained with the research behind it. BJ Fogg's behavior model, James Clear's implementation intentions, Wendy Wood's context...
Ideas
The Eisenhower Matrix: Prioritize Like a President
The Eisenhower matrix explained, with its actual history, its relationship to Stephen Covey's popularization, and the research on priority...
Creative Block: Why It Happens and How to Break It
A research-grounded examination of creative block as a symptom with multiple causes rather than a single condition.
Why Your Morning Routine Fails (And What Actually Works)
The research on why morning routines collapse and what specific design principles make routines stick.
Technology
AI Source Trust Checklist: 10 Checks Before You Trust an AI Answer
A structured 10-check protocol for evaluating AI-generated answers before acting on them. Includes scoring rubric, worked examples, printable worksheet, and a classroom learning activity. For students, educators, and knowledge workers.
Must-Have Free Tools for Every Content Creator in 2026
A comprehensive guide to free online tools for content creators: image editing, PDF management, video conversion, SEO analysis, and document...
Zoom, Google Meet, or Teams: Video Conferencing in 2026
Zoom vs Google Meet vs Microsoft Teams compared: pricing tables, participant limits, recording storage, AI meeting features (Zoom AI Companion,...
technology
AI for Knowledge Work: Practical Workflows, Prompts, and Limits
A practical hub for using AI in real knowledge work - research, writing, analysis, and learning - without losing quality or trust. Concrete workflows, prompting principles, and a non-negotiable verification step.
work-skills
Productivity Evidence Map: What the Research Actually Supports
Common productivity claims rated by how strong the research behind them really is. Robust principles - the cost of task-switching, specific goals, and if-then plans - separated from popular-but-unproven tactics like the 'optimal' Pomodoro ratio or the single 'best' system, with what to actually do about it.
Work & Skills
Understanding Deep Work and Shallow Work Concepts
Deep work and shallow work defined with Cal Newport's framework and the research behind it. Sophie Leroy's attention residue, Gloria Mark's...
Identifying Toxic Workplace Signs and Responses
Twelve diagnostic signs of a toxic workplace grounded in organizational psychology. Donald Sull's ten attributes, MIT Sloan data on attrition,...
Crafting a Strong Interview Answer: Personal Story
A structural answer to the most common interview opener, built from hiring research on first impressions, decision-cascade effects, and the...
Culture
What Was the Silk Road? Trade Routes and Cultural Exchange
The Silk Road was not a single road but a network of routes connecting East Asia to Europe for over a millennium.
Renaissance: A Cultural Rebirth in Europe
The Renaissance was a European cultural and intellectual movement, roughly 1300-1600, that rediscovered classical antiquity and reimagined the...
The Protestant Reformation and Its Historical Impact
The Protestant Reformation began in 1517 when Martin Luther challenged the Church's sale of indulgences.
culture
Async Communication Strategies for Distributed Teams
Async communication playbook from GitLab, Automattic, and Doist. Documentation standards, decision records, time-zone rhythms, and the hybrid...
Latest Guides
Goodhart's Law: When a Measure Becomes a Target
Goodhart's Law explained through its origin in monetary policy, Strathern's famous phrasing, the four flavors of Goodhart, surrogation, reward hacking, and how to defend against it.
The Spacing Effect: Why Cramming Fails and Spaced Practice Wins
The spacing effect explained through Ebbinghaus's original work, the Cepeda meta-analysis, and Bjork's desirable difficulties, with a practical guide to spaced study.
Productivity Evidence Map: What the Research Actually Supports
Common productivity claims rated by how strong the research behind them really is. Robust principles - the cost of task-switching, specific goals, and if-then plans - separated from popular-but-unproven tactics like the 'optimal' Pomodoro ratio or the single 'best' system, with what to actually do about it.
Cognitive Bias Evidence Map: Robust vs. Failed-to-Replicate Biases
An evidence map of well-known cognitive biases rated by how well they replicate - separating robust findings (anchoring, framing, confirmation bias) from contested ones (ego depletion, social priming).
Learning Science Evidence Map: What the Research Actually Shows
A sourced evidence map of core learning-science findings: each technique rated by evidence strength and effect type, with every claim linked to a named peer-reviewed study.
AI for Knowledge Work: Practical Workflows, Prompts, and Limits
A practical hub for using AI in real knowledge work - research, writing, analysis, and learning - without losing quality or trust. Concrete workflows, prompting principles, and a non-negotiable verification step.
Better Decisions Under Uncertainty: A Practical Guide and Toolkit
A practical guide to decision-making under uncertainty: the core cognitive biases, probabilistic thinking, premortems, a decision journal template, and a bias checklist you can apply immediately.
AI Source Trust Checklist: 10 Checks Before You Trust an AI Answer
A structured 10-check protocol for evaluating AI-generated answers before acting on them. Includes scoring rubric, worked examples, printable worksheet, and a classroom learning activity. For students, educators, and knowledge workers.
Understanding Deep Work and Shallow Work Concepts
Deep work and shallow work defined with Cal Newport's framework and the research behind it. Sophie Leroy's attention residue, Gloria Mark's...
Identifying Toxic Workplace Signs and Responses
Twelve diagnostic signs of a toxic workplace grounded in organizational psychology. Donald Sull's ten attributes, MIT Sloan data on attrition,...
Crafting a Strong Interview Answer: Personal Story
A structural answer to the most common interview opener, built from hiring research on first impressions, decision-cascade effects, and the...
Understanding Habit Stacking for Lasting Routines
Habit stacking explained with the research behind it. BJ Fogg's behavior model, James Clear's implementation intentions, Wendy Wood's context...
Concepts
Goodhart's Law: When a Measure Becomes a Target
Goodhart's Law explained through its origin in monetary policy, Strathern's famous phrasing, the four flavors of Goodhart, surrogation, reward hacking, and how to defend against it.
The Spacing Effect: Why Cramming Fails and Spaced Practice Wins
The spacing effect explained through Ebbinghaus's original work, the Cepeda meta-analysis, and Bjork's desirable difficulties, with a practical guide to spaced study.
Cognitive Bias Evidence Map: Robust vs. Failed-to-Replicate Biases
An evidence map of well-known cognitive biases rated by how well they replicate - separating robust findings (anchoring, framing, confirmation bias) from contested ones (ego depletion, social priming).
Learning Science Evidence Map: What the Research Actually Shows
A sourced evidence map of core learning-science findings: each technique rated by evidence strength and effect type, with every claim linked to a named peer-reviewed study.
Ideas
Understanding Habit Stacking for Lasting Routines
Habit stacking explained with the research behind it. BJ Fogg's behavior model, James Clear's implementation intentions, Wendy Wood's context...
The Eisenhower Matrix: Prioritize Like a President
The Eisenhower matrix explained, with its actual history, its relationship to Stephen Covey's popularization, and the research on priority...
Creative Block: Why It Happens and How to Break It
A research-grounded examination of creative block as a symptom with multiple causes rather than a single condition.
Why Your Morning Routine Fails (And What Actually Works)
The research on why morning routines collapse and what specific design principles make routines stick.
Technology
AI for Knowledge Work: Practical Workflows, Prompts, and Limits
A practical hub for using AI in real knowledge work - research, writing, analysis, and learning - without losing quality or trust. Concrete workflows, prompting principles, and a non-negotiable verification step.
AI Source Trust Checklist: 10 Checks Before You Trust an AI Answer
A structured 10-check protocol for evaluating AI-generated answers before acting on them. Includes scoring rubric, worked examples, printable worksheet, and a classroom learning activity. For students, educators, and knowledge workers.
Must-Have Free Tools for Every Content Creator in 2026
A comprehensive guide to free online tools for content creators: image editing, PDF management, video conversion, SEO analysis, and document...
Zoom, Google Meet, or Teams: Video Conferencing in 2026
Zoom vs Google Meet vs Microsoft Teams compared: pricing tables, participant limits, recording storage, AI meeting features (Zoom AI Companion,...
Work & Skills
Productivity Evidence Map: What the Research Actually Supports
Common productivity claims rated by how strong the research behind them really is. Robust principles - the cost of task-switching, specific goals, and if-then plans - separated from popular-but-unproven tactics like the 'optimal' Pomodoro ratio or the single 'best' system, with what to actually do about it.
Understanding Deep Work and Shallow Work Concepts
Deep work and shallow work defined with Cal Newport's framework and the research behind it. Sophie Leroy's attention residue, Gloria Mark's...
Identifying Toxic Workplace Signs and Responses
Twelve diagnostic signs of a toxic workplace grounded in organizational psychology. Donald Sull's ten attributes, MIT Sloan data on attrition,...
Crafting a Strong Interview Answer: Personal Story
A structural answer to the most common interview opener, built from hiring research on first impressions, decision-cascade effects, and the...