Philippine Salary Deductions Explained (2026): SSS, PhilHealth, Pag-IBIG and Tax
Your offer says ₱30,000 and your payslip says ₱26,542.45. Here is exactly where the rest goes — the three contributions...
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Why CSV Libraries Do Not Stop Formula Injection
The same six values written by Python, by PHP, and by joining strings with commas. The libraries fix the commas and the...
What a Spreadsheet Does to Your CSV
Twenty-six values through a correct CSV file, into a spreadsheet, and back. Eight came out visibly different, three more...
Which Image Operations Strip Metadata
A source image with six identifying tags and GPS coordinates, put through eight operations. Pillow drops everything unle...
Why Your Best Performers Get Worse
A thousand simulated pages whose true conversion rates never change. Selected on one period's numbers, the top tenth app...
What Happens When You Test Twenty Metrics
A dashboard rarely shows one number. Simulated with nothing real to find, examining twenty metrics produced at least one...
How Big Does an A/B Test Need to Be?
Sample size is usually decided by how long someone will wait. Simulated across a grid, a genuine one-point lift on a ten...
What Happens When You Check an A/B Test Early
Twenty thousand simulated experiments with no real difference in them. Read once at the end, 4.9% came back significant,...
What Your Monitoring Costs the Database
Metadata queries are expensive because the server assembles the answer by walking itself. Measured on production with th...
How to Find What Is Scanning Your Tables
Knowing a table is scanned tells you little; knowing which statement scans it tells you everything. Reading MySQL's stat...
Sixty Percent of Your Reads Use No Index
A database either uses an index to find rows or scans the table, and on a small table the scan is the right choice. Meas...
The Indexes Nobody Reads
Indexes accumulate because nothing ever removes them, and removing one means proving it is unused. MySQL will tell you:...
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