https://sudonull.com/soviet-ic-crystals-topology-analysis
Studying crystals of 18 Soviet microcircuits: structures, markings, manufacturer differences. Useful for developers for reverse engineering. Read details.
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In this project
https://sudonull.com/icmp-tunnel-in-the-linux-kernel-tcp-udp-encapsulation
How to implement an ICMP tunnel in the Linux kernel for TCP/UDP traffic encapsulation. Code analysis, Netfilter hooks and working with sk_buff. Useful for middle/senior developers.
https://sudonull.com/developers-quotes-code-mcu-circuit-design
Collection of aphorisms from embedded development: code principles, firmware, hardware and management. Useful for middle/senior in stand-ups and code reviews. Read and discuss.
From other projects
https://ymaho.com/ai-in-diagnostics-errors-up-to-80-and-gpt-5-hallucinations
Neural networks make mistakes in 80% of cases in differential diagnosis, and GPT-5 produces hallucinations in 65%. Find out why AI is not yet ready to replace a doctor, and where it is truly useful.
https://ymaho.com/how-to-get-around-sochi-without-a-car-public-transport
Detailed guide for tourists: how to use buses, minibuses, trains, and Lastochkas in Sochi without a car. Useful tips and life hacks.
From the web
USEFUL | English meaning - Cambridge Dictionary
https://dictionary.cambridge.org/dictionary/english/useful
USEFUL definition: 1. effective; helping you to do or achieve something: 2. the time during which something or…. Learn more.
USEFUL Definition & Meaning - Merriam-Webster
https://www.merriam-webster.com/dictionary/useful
Jun 29, 2026 · The meaning of USEFUL is capable of being put to use; especially : serviceable for an end or purpose. How to use useful in a sentence.
USEFUL Synonyms: 84 Similar and Opposite Words - Merriam-Webster
https://www.merriam-webster.com/thesaurus/useful
2 days ago · Synonyms for USEFUL: applicable, practical, applied, applicative, practicable, usable, pragmatic, workable; Antonyms of USEFUL: useless, impractical, impracticable, inapplicable, …
USEFUL Synonyms & Antonyms - 119 words | Thesaurus.com
https://www.thesaurus.com/browse/useful
Find 119 different ways to say USEFUL, along with antonyms, related words, and example sentences at Thesaurus.com.
USEFUL Definition & Meaning | Dictionary.com
https://www.dictionary.com/browse/useful
USEFUL definition: being of use or service; serving some purpose; advantageous, helpful, or of good effect. See examples of useful used in a sentence.
useful adjective - Definition, pictures, pronunciation and usage notes ...
https://www.oxfordlearnersdictionaries.com/definition/english/useful
Definition of useful adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
useful - Wiktionary, the free dictionary
https://en.wiktionary.org/wiki/useful
Jun 2, 2026 · Adjective useful (comparative more useful or usefuller, superlative most useful or usefullest) Having a practical or beneficial use.
USEFUL | definition in the Cambridge English Dictionary
https://dictionary.cambridge.org/us/dictionary/english/useful
USEFUL meaning: 1. effective; helping you to do or achieve something: 2. the time during which something or…. Learn more.
Useful - definition of useful by The Free Dictionary
https://www.thefreedictionary.com/useful
1. being of use or service; serving some purpose; advantageous, helpful, or of good effect: a useful member of society. 2. of practical use; producing material results; supplying common needs.
USEFUL definition and meaning | Collins English Dictionary
https://www.collinsdictionary.com/dictionary/english/useful
If something is useful, you can use it to do something or to help you in some way.
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