Foldable Flight Site Offers Instructions for Advanced Paper Airplane Designs

·1 views

A website called Foldable Flight has been shared on Hacker News, where it drew 48 points and 6 comments. The page is presented as a resource for paper airplane folding. The source material provides little detail beyond the site's name and its listing on the forum. Readers would need to visit the linked site to learn about the specific designs or instructions it contains.

Read the full story at Hacker News

This is an AI-generated summary. ShortSingh links to the original source for the complete article.

Discussion (0)

Five chmod Permission Traps That Catch Developers Out

Standard tutorials recommend chmod 755 and 644 without explaining the permissions they grant. On directories, the read, write and execute bits behave differently: read lists names, write creates or deletes entries, and execute allows traversal, so a directory set to 666 is readable but unusable. The author also highlights confusion around chmod's = and + operators, the capital X flag for applying execute only where appropriate, and how umask is applied. Misplaced digits can unintentionally set setuid or setgid bits, while redirected file creation can yield overly permissive modes such as 644 for SSH keys. The article recommends install -m 600 for sensitive files and suggests a chmod calculator for verifying modes.

0 comments Read more at DEV Community

ProgrammingDEV Community ·

Loop order alone makes a 4096x4096 grid sum 13x slower due to CPU cache misses

A DEV Community author compared two functions that sum the same 4096 by 4096 grid, differing only in whether the outer loop walks rows or columns. Row-order summing took about 11 ms on an Apple M3 laptop, while column-order summing took about 146 ms, roughly 13 times slower. The explanation is that the CPU loads memory in fixed-size cache lines, so reading neighboring elements in a row reuses cached data, while jumping between rows in a column forces a memory fetch on nearly every read. The gap appears once the grid exceeds the cache size, and the author notes that a Float64Array shows the same pattern, indicating the cause is memory layout rather than JavaScript arrays. Suggested fixes include keeping the row loop outermost and accumulating column totals in a separate array, which matched the results of the column-order method at about 12 ms.

0 comments Read more at DEV Community

ProgrammingDEV Community ·

A job offer on LinkedIn came with malware in a Git hook. It's the "Contagious Interview" playbook

A recruiter messaged me on LinkedIn about building the website for a blockchain basketball game. Then they sent a documentation pack as a .tar.gz file. The plan was simple: review the docs, sign the NDA, then we'd schedule a call. The docs were real enough to read. The archive also held a Git hook that would have downloaded a script and run it on my Mac the first time I checked out a branch.

0 comments Read more at DEV Community

ProgrammingDEV Community ·

Apple's HALO Humanoid Hits 91% Task Success Using Qwen Model

Apple disclosed its HALO humanoid system, which calls Alibaba's Qwen model on a Unitree G1 robot and averages 91% success per task. Separately, GitHub reportedly tested 5,000 AI agents collaborating inside a single repository while handling 7,200 pushes per second. Sam Altman argued at Stanford that an affordable token budget can now substitute for work once requiring around 100 top engineers. A study of ChatGPT Deep Research found that blunter prompt tones yielded higher accuracy on multiple-choice questions, with the overly polite phrasing performing worst. The report also highlighted that compute costs and pricing are increasingly shaping which AI tools deliver value.

0 comments Read more at DEV Community