Problem Statement geeksforgeeks.org A celebrity is a person who: Knows no one . Is known by everyone else . Given an N × N matrix: M[i][j] = 1 → i knows j Find the celebrity. Return: Celebrity Index OR -1 if no celebrity exists. Brute Force Intuition In an interview, you can explain it like this: Check every person individually. Verify whether they know nobody and everybody else knows them. Th…

Research Context In the realm of network security and packet analysis, tools like Python (Scapy) or C are the usual go-tos. However, when we want to strip away all abstraction layers from the OS network stack and talk directly to the processor, resources become incredibly scarce. Finding modern, zero-dependency networking tools written in x64 Assembly on the internet is almost impossible today. I…

I started this project in December 2025. Not because anyone asked. Not because I saw a gap in the market. Because I compose chess problems as a hobby and every tool I tried to export a diagram with either watermarked the output, required an account, or exported at 72 DPI like it was still 2003. So I built my own. Seven months later: 5 stars on GitHub, 6 forks, a handful of npm downloads, about $1…

You move your site behind Cloudflare (or CloudFront, or any CDN/WAF), watch the dashboard light up green, and feel safe. The edge will soak up the floods now. Right? Mostly. But there is a quiet failure mode that undoes the whole thing in one step, and almost nobody tests for it: origin IP exposure . The problem in one sentence A CDN only filters the traffic that actually passes through it. If yo…

Research Context In cybersecurity research and Red Team simulations, developing custom tools requires a deep understanding of host-based evasion. When an agent lands on a target system, modern Blue Teams and Endpoint Detection and Response (EDR) solutions will attempt to attach a disassembler or a debugger to analyze the suspicious process. How do these processes defend themselves against analysi…

In the 21st century, standing still is the fastest way to fall behind. You either keep learning or you slowly become obsolete. I'm an accountant by profession. Numbers have always been my language, whether they're in financial statements, tax returns or spreadsheets. But curiosity has a funny way of refusing to stay in its lane. So, despite a full-time 9 to 5, I enrolled in a data science bootcam…

I created this piece for the purposes of entering the AWS x Vercel H0 Hackathon. #H0Hackathon What I built I built Cast Wide, a tool that takes one idea and rewrites it for different platforms like Twitter, LinkedIn, and Reddit. The important part is that it does not just paraphrase. It actually changes the structure, tone, and writing style so the content feels natural on each platform. For exam…

The difficult policy question in agent-ready commerce is not whether the platform has a return policy page. The difficult question is whether the platform can safely answer this: Can an agent tell this buyer, in this region, for this product, through this channel, that this item can be returned under these conditions? That is a different problem. A public policy page may exist. A product page may…

This article is about my experience using Opus 4.8 to read the results of an MRI and give me a sort of second opinion on the diagnosis. Of course, I know the technology might not be there yet, which is why I'm sharing this article. Maybe it can help someone or at least provide a bit of information or entertainment. Disclaimer: I'm of course not a doctor (this is actually the problem!) so please t…

I Built Finito: A Production Tracker That Actually Gets Music Producers *I created this post for the purposes of entering the H0 Hackathon. H0Hackathon The Problem I Kept Ignoring Producers always struggle to finish their tracks — drives are always full of unfinished projects, and the reason isn't talent, it's having no system. I understand this issue personally because I have a music background.…

Unfair changes to student loans and concerns about job prospects must be weighed against the life-changing potential of education Is going to university financially worthwhile? New research on graduate incomes is unlikely to help the beleaguered sector’s reputation. Even though most benefit from an earnings premium, worth around £100,000 on average over a lifetime (after tax and student loan repa…

A SpaceX Falcon 9 rocket carrying 24 Starlink satellites lifted off from Vandenberg Space Force Base in California on Sunday, June 28, 2026.

The Space Shuttle's five1 general-purpose computers played a critical role in each flight: controlling the engines, monitoring thousands of sensors, displaying data to the astronauts, and navigating the Shuttle. Each computer consisted of two 60-pound aluminum-alloy boxes: the box on the right is the CPU, a 32-bit processor that executed 420,000 instructions per second. These computers were desig…

Around 40% of people around the world are avoiding the news. Here's why, according to a psychologist.

When seniors seem like they're "losing it," depression, not dementia, may be at play. Listening to and empathizing with seniors and their loved ones can lead to an optimal outcome.

Volunteers provide counselling and funeral directors donate coffins after loss of at least 1,430 lives The bodies turn up on motorcycles, in the backs of cars or the load beds of pickup trucks: victims of a natural disaster that has shaken an already fragile nation to its core. “[Yesterday], the entire street was packed with people arriving with deceased relatives,” said Camila Rodríguez, a psyc…

A common epistemic principle is that certainty is never justified: there is always some nonzero probability of error. But I’m struggling to see how this principle can itself be justified without ...

University of Chicago researchers may have found the shortcut quantum computers have needed for decades. In this video, we break down a major quantum computing breakthrough involving QLDPC error correction codes, reconfigurable atom arrays, and movable neutral atoms controlled by laser light. This new approach could reduce the number of physical qubits needed for practical […]

Welcome back to TechCrunch Mobility, your hub for the future of transportation and now, more than ever, how AI is playing a part.

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