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Drag Rises With Speed Squared: The Real Cost of 130 km/h
Cloud VPC Design: Public vs Private Subnets, NAT Gateways, and the Three-Tier Architecture
AWS VPCs, GCP VPCs, and Azure VNets follow the same three-tier pattern — public subnets for internet-facing resources, private subnets for application and data tiers. Here's the terminology across providers, NAT Gateway mechanics, VPC peering, and the four most common cloud network design mistakes.
Retirement Calculator — Find Your Actual Corpus Target Before It's Too Late
Learn why most retirement estimates are too low, how inflation and longevity compound the planning challenge, the key variables that determine your target corpus, and how a free retirement calculator gives you a defensible number.
BGP: How Internet Routing Works — and Why Route Leaks Can Take Down Major Services
BGP is the protocol that routes traffic across the internet's 80,000 autonomous systems — and its trust model is why a misconfiguration at a small ISP took down Cloudflare, Amazon, and Facebook for two hours. Here's how BGP works, how anycast CDNs use it, and why RPKI is the partial fix.
RD Goal Calculator — Find the Exact Monthly Deposit for Any Savings Goal
Learn how to work backwards from any savings target to a specific monthly deposit, plan multiple goals simultaneously, and adjust timelines when the monthly amount exceeds budget — with a free RD goal calculator.
Loan Planner — Master Your Amortisation Schedule & Prepayment Strategy
Learn how to read an amortisation schedule, find the crossover point where principal beats interest, why prepayment timing matters, and how to use a free loan planner to take control of any loan.
EMI Calculator — How to Reduce Your Total Loan Cost with 3 Levers
Learn how EMI is structured, why early prepayment saves the most, and how to use the three levers — principal, rate, and tenure — to reduce your total loan cost, with a free EMI calculator.
HTTP Caching Deep Dive: Cache-Control Directives, ETags, and Content Hashing Strategy
Content-hashed filenames with max-age=31536000 can eliminate network requests for returning users. Here's the complete HTTP caching strategy: Cache-Control directives in depth, ETags and conditional requests, the Vary header pitfall, CDN cache busting, and a practical caching strategy by resource type.
Regex for Data Cleaning: Practical Patterns for Messy Real-World Data
Real-world data — phone numbers, dates, emails, log entries, product codes — arrives inconsistently. Here are the regex patterns for the most common data cleaning tasks: phone normalisation, date standardisation, HTML stripping, whitespace cleaning, and log redaction.
Fuzzy Deduplication and Record Linkage: When Exact Matching Isn't Enough
Exact deduplication handles perfect matches — but real data has name variations, address inconsistencies, and multi-source formatting differences. Here's fuzzy matching, the record linkage workflow, edit distance, Soundex, and SQL and Python approaches for production-quality deduplication.
Content Truncation Rules: How Every Platform Cuts Your Text — and How to Write for It
Every platform truncates differently — email subject lines at 50 characters, push notifications at 80, meta descriptions at 155. Here's the truncation rules for major platforms, how to implement word-boundary truncation in code, and using truncation as a deliberate writing technique.
Simple Interest Calculator — Understand Flat-Rate Loans and Their True Cost
Learn how simple interest differs from compound interest, where it's still used in modern finance, why flat-rate loans cost far more than their headline rate suggests, and how to use a free simple interest calculator.
How Gmail Decides Where Your Email Lands: Inbox, Promotions, and Spam Explained
Gmail routes email based primarily on engagement signals — opens, clicks, spam complaints, and whether recipients move messages to Primary. Here's how the three-tier system works, what signals determine Promotions vs. Primary, why list segmentation improves deliverability, and how Outlook differs from Gmail.
