An OpenStreetMap of the City of Atlanta's Monroe Dr NE road-diet redesign — every new signal, beacon, roundabout, crossing, and lane change from the April 2026 project Q&A, mapped to its real location with source-cited details.
🪞Step through Manacher's linear-time algorithm for finding the longest palindromic substring, with an interactive visualization of each phase.
🌅Compare sunrise and sunset times across different cities throughout the year with interactive charts.
🏠Project mortgage payments, equity buildup, and investment returns across different scenarios.
🔑Compare a cash-funded home purchase—with a margin loan above $1 million—with renting, and see when buying and selling comes out ahead.
📄Explore how B-Tree storage organizes cells within slotted pages, with interactive visualization of cell layouts, offset pointers, and free space management.
📊Compare demographic and statistical data across states, cities, and neighborhoods in California, New York, and Georgia.
📉Visualize how much you can borrow on margin without facing a margin call during market drawdowns, with historical crash scenarios.
👥Stacked bar chart showing employee headcount trends across major tech companies from 2011 to 2025.
🐍Practice Python coding challenges with an in-browser editor and automated test validation, powered by Pyodide.
🪟Step through the monotonic deque approach to the sliding window maximum problem, with interactive visualization of each phase.
🏛️Explore the five eras of Roman civilization from Kingdom to Byzantine Empire, with an interactive timeline, territorial maps, and historical summaries.
🤖See which free models on OpenRouter are actually good, ranked by ArtificialAnalysis intelligence index.
🧭Compare Forward Deployed Engineer roles across prestigious smaller tech companies — skills, role focus, target industry, and more.
🤝The 10 largest US M&A deals announced during each presidential term from Clinton I through Trump II, sized as a share of US GDP for each deal's year.
⚖️US equal-weighted vs US cap-weighted vs World cap-weighted ETFs over time — AI concentration, drawdowns, and total return with selectable metric pairs.
📈Each year's biggest tech IPO from 1990–2025, sized as parts per million of the S&P 500's total market cap on the IPO date.
🚀If SpaceX, OpenAI, or Anthropic IPOs, how much of it does a $200k index-fund position actually buy? Compare VT, VTI, VOO, and equal-weighted EUSA — and see why equal-weighting ignores valuation entirely.
🗽Filter the world's countries by compound percentile of government and economic freedom — combining Freedom House, EIU, Heritage, and Fraser indices.
☁️Side-by-side cost comparison of exe.dev's Personal & Cloud Pool plans against Hetzner Cloud CCX and AWS EC2 m7a, matched 1-to-1 by vCPU and RAM, with a non-linear transfer slider.
🔥A staff engineer's design doc for AWS's microVM monitor — architecture, threat model, snapshots, and how it compares to QEMU, gVisor, and containers.
⚡A staff engineer's design doc for the open-source LLM inference engine — PagedAttention, continuous batching, prefix caching, and the V1 rewrite.
🐘A staff engineer's design doc for the OLAP database — parts and granules, vectorized SIMD execution, distributed two-stage aggregation, ClickHouse Cloud's SharedMergeTree, and how it compares to Snowflake, BigQuery, and Druid.
🧪A working Python developer's guide to property-based testing with Hypothesis — strategies, the @given decorator, automatic shrinking to minimal counterexamples, stateful testing, and the properties worth asserting.
🧊A staff engineer's design doc for the open table format — the metadata tree, snapshots and ACID commits, hidden partitioning, schema evolution, merge-on-read deletion vectors, and how Dremio, Snowflake, and Databricks build on it.
♾️A staff engineer's design doc for Temporal & Cadence — workflows as code, event-sourced history and deterministic replay, the durable toolkit (signals, timers, sagas), the server's Frontend/History/Matching services, versioning long-running workflows, the Cadence→Temporal fork, and what Hacker News makes of it all.
📡How services collect, store, and query time-series — instrument → collect → store → query → visualize → alert. Pull vs push, the cardinality problem, an interactive comparison of Prometheus, InfluxDB, TimescaleDB & VictoriaMetrics, the Prometheus scaling tier (Thanos/Mimir), and OpenTelemetry.
🔄A staff interview guide to Python's asyncio — the event loop and cooperative concurrency, coroutine vs task vs future, structured concurrency and cancellation with TaskGroup, why one blocking call freezes everything, bounded concurrency, and asyncio vs threads vs processes.
🔀An exhaustive, primary-source comparison of Temporal, Apache Airflow, and AWS Step Functions — three machines that share the word "workflow." Execution & durability models, the same workflow coded three ways, architecture, scaling, pricing, and an interactive filter/highlight comparison matrix. Companion to the Durable Execution doc.
🚦A system-design walkthrough of serving LLMs at scale — the prefill/decode asymmetry, KV-cache capacity math with an interactive calculator, speculative decoding, disaggregated prefill/decode serving, cache-aware routing, and how vLLM, TensorRT-LLM, and SGLang compare.
💵Break down MIT's Living Wage “typical expenses” as a pie chart — pick a city and family size and see where a household's budget goes.
🚲Set your weekly NYC riding habits and a bike price to see how many months until buying an e-bike beats renting Citi Bike, LimePrime, or LimePass.
🎬Georgia's IMAX screens drawn to true scale as nested rectangles on a shared floor, with a person for scale — Royal Cinemas 14 in Savannah (billed as the world's tallest IMAX), Regal Mall of Georgia, and Regal Atlantic Station. Hover to isolate a screen; toggle any of them.
🏙️All 50 states ranked by how much of the state lives in its single biggest metro — from Rhode Island, which is entirely Providence, to West Virginia, where Charleston holds barely a ninth. Switch between metro and combined-area definitions, or view it as a tile map.