Resources
Blog
Articles and guides on productivity, SEO, and building with free browser tools.
Showing 9–12 of 70 articles
Celsius to Fahrenheit: The Exact Formula, Mental Math Shortcuts, and Absolute Zero
Convert temperatures between Celsius and Fahrenheit accurately. Learn the 9/5 formula, fast mental math estimation tricks, and key thermodynamic benchmarks.
Sep 22, 2026 · 7 min read
How Leap Years and Leap Seconds Work: The Astronomical Math of the Gregorian Calendar
Explore calendar math and astronomical timekeeping. Discover the 400-year Gregorian leap year rule, atomic clock leap seconds, and age calculations.
Sep 22, 2026 · 8 min read
How to Fix CORS Errors: Access-Control-Allow-Origin, Preflight OPTIONS, and Headers Explained
Solve CORS blocking in web applications. Learn how Access-Control-Allow-Origin works, how to handle OPTIONS preflight requests, and how to debug headers locally.
Sep 22, 2026 · 10 min read
UUIDv4 vs UUIDv7: Why Modern Databases Are Moving to Timestamp-Ordered Identifiers
Stop B-tree index fragmentation in PostgreSQL and MySQL. Discover why timestamp-ordered UUIDv7 outpaces random UUIDv4 for high-throughput database tables.
Sep 22, 2026 · 9 min read