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AI Model Price Calculator: What That Prompt Actually Costs
The same prompt can cost half a cent or fifty cents depending on the model. Estimate your bill from your own token usage, or compare the flagships head to head — with live prices.
Why Birds Can Sit on Power Lines (and You Can't)
A bird sits on a power line carrying thousands of volts, completely relaxed. Grab that same wire and it would kill you. The difference is not the volts — it is the volts across you.
Seattle Transit: When Is the Next Bus?
Live arrivals for any stop, plus trip suggestions. Just say where you are starting.
Classic Games, Revisited
Wordle, 2048, Mastermind, Minesweeper, Sudoku — five games you know, playable right here. Underneath them: three ideas from math and computer science.
Trending Podcasts
The fastest-rising podcast episodes on YouTube, ranked by live views — trending now plus the most watched of the month.
The Monthly Book Spin
Five books a month, picked by genre draw and read in public — browse bestsellers and genre shelves, and track your list.
The Birthday Paradox: 23 Strangers, One Shared Birthday, and the Math Behind Digital Fingerprints
23 strangers, one shared birthday: why pairs beat people, how to win the bar bet, and why the fingerprints securing the internet must be twice as long as you'd think.
Wine, Untangled: Every Type Explained
Red, white, rosé, sparkling, sweet, fortified: what the words mean, which grapes matter, and why Dry is sweeter than Brut — every wine type in one guide.
8,000 Years of Wine: From Clay Pots in Georgia to Your Dinner Table
Clay jars in Georgia, monks mapping Burgundy, a root louse that nearly killed every vine in Europe, and the blind tasting that put California on the map — 8,000 years of wine in one story.
Stock Lookup
One page per company: type any US stock ticker to see what the business does, the quote, five years of financials, and SEC filings — plus how to read each part in 30 seconds.
Occam’s Razor and Hanlon’s Razor: Start With the Simplest Story
Your bike tire is flat: nail, or a sneaky stranger in the night? The nail needs one ordinary thing to be true. That habit — fewest guesses first — is Occam’s Razor, and its sibling Hanlon’s Razor applies it to people: a forgotten seat at lunch is almost never a plot.
Newton’s Laws of Motion: Push It, Race It, Bounce It
Three rules from 300 years ago that still steer every car, ball, and rocket — taught with buses, shopping carts, and balloons.
TFT Set 18: Every Champion and the Items They Want
All 36 core items with recipes — plus who actually wants each one, counted off the 45 comp boards. Searchable, filterable, and built for mid-game glances.
Chess Notation Trainer: Learn It, Then Drill It
What e4, Nf3 and O-O mean, plus a trainer to make it stick.
EA Sports FC 27 Skill Moves: The 5 That Win Games (Plus the 4 New Ones)
FC 27 added four new skill moves, but five old boring tricks still win more matches than everything else combined. The confirmed combos, the star-rating rules, and where each move actually fits.
The Lindy Effect: Old Things Outlive New Things
Broadway actors in the 1960s noticed plays that survived a hundred performances usually survived a hundred more. That deli-counter rule — the Lindy effect — says the older a non-perishable thing is, the longer it will probably last. Here is how to use it, and where it breaks.
Why Do Planes Stay Up? (Your Teacher's Answer Was Mostly Wrong)
A fully loaded 747 weighs about 440 tonnes, and the only thing holding it up is air. The story your teacher drew on the board — curved wing, hurrying air, Bernoulli — is neat, confident, and wrong. The real answer is simpler: wings shove air down, and the air shoves back.
Interest Rates: The Fed's One Lever
Twelve people meet eight times a year and decide a single number — and within weeks, your mortgage, your credit card, and your savings account all move. How the Fed's one lever cools prices, costs jobs, and what it can never fix.
Decoding the World's Flags: The Six Families You Need to Know
There are 195 countries but nowhere near 195 ideas. Six design families cover most of the world, and once you know them you can place a flag you have never seen. Includes every flag, searchable, and a quiz that works through all of them.
Regression to the Mean: Why the Best Get Worse and the Worst Get Better
Flight instructors in the 1960s Israeli Air Force had years of evidence that praise ruined landings and screaming fixed them. They were right about the pattern and wrong about the cause — and the same mistake is waiting in medicine, money, hiring and your best week of the year.
TFT Set 18 Comps: All 45 Teams for Enchanted Wilds
A comp sheet to keep open while you play. All 45 Enchanted Wilds teams with early board, final board and item priority — searchable by champion, grouped by tier, and laid out by the rows you actually place units in.
Maslow's Hierarchy of Needs: Why You Can't Think Straight When You're Hungry
Your needs take turns, and the emptiest one grabs your attention whether you like it or not. The five levels explained from scratch — plus the twist that the famous pyramid everyone uses was drawn by someone else entirely, and says something Maslow never believed.
How Sleep Actually Works: The Two Switches That Decide When You Sleep
You don't decide to fall asleep — two separate systems do, and they have to agree. The mechanics of sleep pressure, the body clock, the flip-flop switch that flips you under, and why each one failing gives you a different kind of sleepless night.
The Science of Caffeine: How Coffee Actually Wakes Up Your Brain
Caffeine doesn't give you energy — it blocks the molecule that tells your brain it's tired. The real chemistry behind adenosine, dopamine, the afternoon crash, tolerance, and why coffee hits everyone differently.
The History of Coffee: From a Goat Herder's Legend to Your Morning Cup
A goat herder's legend, a stolen plant, a smuggler, and the Boston Tea Party — the real, surprisingly dramatic history of coffee, plus the chemistry behind why Arabica tastes smoother than Robusta.
The Scotch Gambit: A Pawn Sacrificed for Early Advantage
A chess opening where White hands over a pawn on purpose — the target it aims at, two real traps that punish greed, and the one line that actually holds up. Includes a full in-browser analysis board with a live chess engine.
Loss Aversion: Why Losing $100 Hurts More Than Winning $100 Feels Good
A fair coin-flip bet that almost nobody takes, and the wiring behind it — the same bias behind free trials, overpriced insurance, and stocks people can’t bring themselves to sell.
Electricity, Explained With a Water Hose
Volts, amps, watts, and kilowatt-hours, explained with one running picture: a water tower on a hill, a hose, and a house.
Why Money Loses Value: A Short History of Inflation
Inflation isn't things getting more expensive — it's money getting weaker. Follow one small island economy from the gold standard through 1971, the 1970s, and 2021 to see why.
Inside Meta's Q2 2026 Earnings: A Great Ad Business Funding an Expensive Bet
Meta beat revenue, missed EPS, and missed on guidance — a rubric-graded summary of the Q2 2026 earnings report, straight from the press release, call transcript, and presentation deck.
Why Is the Sky Blue?
A first-principles proof — two variables, two rules, two equations — for why the afternoon sky is blue and the sunset turns red.
Inside the Balance Sheet of the Most Profitable Company on the Planet
Alphabet's real balance sheet and income statement, line by line — what $704 billion in assets actually is, why total assets don't equal safety, and how a real 10-Q differs from the simplified version in Part 1, with interactive widgets built from the real numbers.
Financial Statements 101: A Beginner's Guide to the Balance Sheet & Income Statement
The balance sheet and income statement, explained from scratch — what Assets = Liabilities + Equity actually means, why revenue isn't profit, and how the two statements connect, with interactive widgets so you can build one yourself.
Game Theory 101: The Strategic Models Worth Knowing
Ten strategic ideas worth knowing — the Prisoner's Dilemma, Nash Equilibrium, and more — with interactive widgets so you can play through each concept yourself, not just read about it.
Pocket Laws 101: The Mental Models Worth Carrying Around
Fourteen mental models worth keeping in your pocket — Murphy's Law, Jevons Paradox, Goodhart's Law, the Dunning-Kruger Effect, and more — the kind of ideas that explain a bad meeting, a blown deadline, or your own bad decision right as it's happening.
Geeks of Greeks: A Beginner’s Guide to Options Greeks
Delta, Gamma, Theta, Vega, Rho, and implied volatility, explained the way an engineer would explain them — as partial derivatives of an option’s price, each isolating one input at a time. No trading advice, just the mechanics, with a worked dollar example for each.
AI Made Code Cheap. Verification Just Got Expensive.
A one-year follow-up to “When AI Codes the Future, What Becomes of Human Ingenuity?” Last August, I wrote that human ingenuity would move from execution to orchestration. It did — faster than I expect...
When AI Codes the Future, What Becomes of Human Ingenuity?
Tomorrow’s inventions won’t ask, “Who built this?” but “Who directed this?”The genius of the future won’t be in lines of code, but in lines of thought. Not long ago, writing code was seen as the pinna...
Running Through History: 10Ks in Europe’s Greatest Cities
Running has always been my way of exploring a city — it’s intimate, it’s raw, and it takes you through places tourists sometimes miss. On my recent trip to Europe, I found few beautiful 10K routes in...
Teamfight Tactics (TFT) Items: Your Super Simple Guide to Gearing Up Your Champions!
What every TFT item does, which components build it, and who wants it — the beginner-friendly guide to gearing up.
What Stands in the Way of AGI? The Looming Energy Crisis?
Imagine you’re trying to build the smartest robot brain ever. Every time you make its brain cells (computer chips) twice as smart, they also get twice as hungry for food (electricity) and produce twic...
The Power of 2 in Computer Science: Fundamentals
Introduction Have you ever wondered why computers seem to love the number 2 so much? Well, it all starts with something called the binary system, which is the foundation of all computing. In this arti...
Understanding Sharding: Scaling Databases Horizontally
As data grows exponentially, it becomes crucial to ensure your database can handle the increased load while maintaining performance. Sharding, a form of database partitioning, is a powerful technique...
Message Queues: The Backbone of Scalable Software Systems
Think of a message queue like a school cafeteria line. Each student (producer) writes down their lunch order on a piece of paper (message) and puts it in a box (queue). The cafeteria workers (consumer...
Hashing 101: From Passwords to Blockchain
Imagine you have a huge collection of toys scattered all over your room. To keep things organized, you use a magical toy box with a special scanner. This scanner gives each toy a unique number and tel...
Java Garbage Collection Explained
Java Garbage Collection Imagine you have an office filled with documents, and every time you work on a document, you leave it scattered on your desk. Eventually, the desk becomes so cluttered that you...
Mastering EA FIFA FC 24: An In-Depth Guide to Skill Moves
The thrill of outmaneuvering your opponent with a dazzling display of skill moves is one of the most exhilarating aspects of playing FIFA FC 24. Whether you’re aiming to break through a solid defense...
Mastering the Two Pointers Technique: An In-Depth Guide
The world of coding interviews is filled with a variety of patterns and techniques designed to solve common algorithmic problems efficiently. One such powerful and versatile technique is the Two Point...
Multimodal AI: The Next Frontier in Personalized Education
Introduction: OpenAI launched their new model, ChatGPT-4o, yesterday on May 13th. To showcase its capabilities, they shared a video of a student using the model to solve and understand a complex geome...
On the Road to Autonomy: The Transformative Impact of Self-Driving Cars
Introduction Imagine a world where cars drive themselves, streets are safer, and traffic jams are a thing of the past. This isn’t just a futuristic vision; it’s quickly becoming a reality, and I’ve wi...
Beyond Coding: The Rise of Product Engineers in the AI Era
Introduction: Historically, software engineers spent considerable time on mundane coding tasks, areas where AI can now excel. For software engineers, this shift signals a transformative change in job...
Coding Pattern I — Sliding Window
In the realm of algorithmic problem-solving, the Sliding Window technique stands out for its efficiency and elegance, especially in handling array or list-related challenges. This approach is particul...
Demystifying Authentication: Sessions, Tokens, JWT, SSO, and OAuth 2.0
In the digital world, ensuring that a user is who they claim to be is crucial and ensuring secure access and interaction with applications is paramount. This requires understanding both authentication...
Simplifying API Client Integration: The Shift from REST to GraphQL
API client integration with REST APIs presents challenges throughout the software development lifecycle, including inefficient data handling, scalability issues, and lengthy integration processes, neg...
Integrating ChatGPT into Your Daily Life: A Practical Guide
In today’s fast-paced world, artificial intelligence (AI) has become more than just a buzzword. It’s transforming how we live, work, and interact. One of the most accessible forms of AI is ChatGPT, an...
Artificial Intelligence in Everyday Life: A Seamless Integration
In the last decade, Artificial Intelligence (AI) has moved from the realm of science fiction to an integral part of our daily lives. Far from the sentient robots of Hollywood’s imagination, AI today i...