Can a Deleted File Be Recovered? We Erased the Whole Volume and Read It Back
We wrote a file marked so it could not be mistaken for anything else, deleted it, then erased the entire volume the way...
Guides & How-tos · Worked examples · Real numbers
Developer Tools guides
Step-by-step how-tos, head-to-head comparisons and honest roundups — every guide worked through with current figures, then backed by a RECATOOLS calculator or AI-directory entry so you can act on it.
185 guides published
15 topic areas
Latest guide Aug 2026
Health & Wellness
8
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6
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6
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Cyber Threat Intel
6
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5
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Latency vs Bandwidth: Which One Are You Actually Waiting For?
Internet plans are sold in one number, and for most of what you do all day it is the smaller half of the answer. Asking...
Why Is My PDF So Big? It Is Probably a Picture of Text
We built one A4 page both ways and weighed them. As text: 8,256 bytes, with 4,791 searchable characters. The same page s...
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Why Is My Disk Full? Every Tool Is Answering a Different Question
The same 494 GB drive reports 6 per cent used, 53 per cent used and 56.3 per cent used depending on what you ask — and a...
How to Remove the Background from an Image
There are two methods and almost every article pretends there is one. A flood fill removes what matches the background a...
Does Re-Saving a JPEG Make It Worse?
Re-saving a JPEG is nearly lossless at exactly one quality — the one it was already saved at — and roughly forty times c...
Why "Random" Is Almost Never Random — and What a Fairness Test Cannot See
We fed the same rejection-sampling helper a cryptographic source and a 1960s textbook generator, 600,000 draws each. The...
Which Image Format, and Why Your Photos Are Too Big
One of our own hero photos was 198,372 bytes. It is 59,766 now — same photograph, same dimensions; we finally compressed...
UUID v4 vs v7 in 2026: v1 Was Never the Sortable One
RFC 9562 replaced RFC 4122 in May 2024, and the advice most codebases still follow did not update with it. UUID v1 is ti...
Decoding a JWT Is Not Verifying It
A decoder shows you the claims; it does not tell you whether to believe them. RFC 7519 §7.2 lists ten validation steps a...
Encoding Is Not Encryption: Base64, Percent-Encoding and the Confusion That Leaks Data
The RFC that defines Base64 says in its own Security Considerations that base encoding "visually hides" a password but "...
Self-Host Firecrawl with Docker: Scrape the Web into LLM-Ready Markdown (2026)
We cloned Firecrawl v2.11.0, built its seven-service Docker stack, and scraped our own homepage into clean markdown — no...
Self-Host n8n with Docker: From Zero to Your First Webhook (2026)
One container, one volume, one real webhook: we self-hosted n8n 2.30.8 with Docker on macOS and captured every command,...
How to Set Up Hermes Agent on a Mac (2026)
Executed walkthrough of installing Hermes Agent v0.18.2 on macOS: the official script, the PATH gotcha, doctor checks, a...
How to Set Up OpenCode on a Mac (2026)
Executed walkthrough of OpenCode v1.18.1 on macOS: Homebrew install, provider auth, free local Ollama option, first run...
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