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Practical guides covering developer tools, health metrics, SEO, converters and more — written to be actually useful.
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Your List Still Has Duplicates After Removing Duplicates
Why BMI Is Flawed — And What to Use Alongside It
BMI is a useful population-level tool that's routinely misapplied to individuals. Here's what it genuinely measures, where it fails, and which complementary measures give a more accurate picture of metabolic health.
DKIM Key Rotation, Multiple Selectors, and Debugging Silent Failures
DKIM breaks silently and the symptoms look like spam problems. Here's key rotation without disruption, why DKIM alignment matters for DMARC, multiple selectors for multiple sending sources, and how to debug the most common failure modes.
How Much Water Do You Actually Need? The 8-Glasses Rule Examined
The 8-glasses-a-day rule has almost no scientific basis. Here's how the body actually regulates hydration, what genuinely affects your water needs, how to use urine colour as a real-time indicator, and when the rule breaks down.
UUID v1, v4, v5, v7 Compared — Which Version Should You Actually Use?
UUID v1, v3, v4, v5, and v7 all work differently and suit different use cases. Here's when to use each — including why v7 is now the recommended choice for database primary keys.
Biological Age vs. Chronological Age: Why Your Birthday Isn't the Whole Story
Your birthday tells you how long you've been alive — not how old your body actually is. Biological age can be years younger or older than your chronological age, and unlike your birth date, it responds to what you do.
DNS Propagation Explained: Why the 48-Hour Wait Is Mostly Avoidable
DNS propagation isn't magic — it's cache expiry. Understanding how TTL, authoritative nameservers, and recursive resolvers interact makes domain migrations predictable and the 48-hour wait mostly avoidable.
Every DNS Record Type Explained: A Practical Reference for A, CNAME, MX, TXT, NS & More
A practical reference for every DNS record type: A, AAAA, CNAME, MX, TXT, NS, SOA, PTR, SRV, CAA — what each does, critical constraints, TTL strategy, and common use cases developers encounter regularly.
Unix Timestamps and Timezone Bugs: What Every Developer Should Know
Timezone bugs cause more production incidents than most developers realise. Here's how Unix timestamps actually work, why "store UTC, convert at display" solves the problem, and the specific bugs that catch teams off guard.
Regex Patterns Every Developer Should Have: A Practical Reference
A practical reference of the regex patterns developers actually need — email, URL, UUID, IP address, dates, semver, hex colours, slugs, and more — with edge cases and caveats for each.
How Long Does a Random String Need to Be? The Birthday Problem Explained
How long does a random string need to be? The birthday problem shows that 6-character codes collide far sooner than most developers expect. Here's how to calculate the right length for tokens, IDs, and API keys.
Energy Converter — Compare kWh, Calories, BTU & Joules Across Contexts
Learn how energy units connect nutrition, electricity bills, and HVAC — what kWh, kcal, BTU, and joules actually represent, cross-domain comparisons, and how to use a free energy converter.
Base64 Encoder/Decoder — What It Is, When to Use It & Why It's Not Encryption
Learn how Base64 encoding works, why it's used in JWTs, Basic Auth, data URIs, and email attachments, why it's not encryption, and how to use a free Base64 encoder/decoder for any data.
