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How to identify a prime number without a computer
Is 170,141,183,460,469,231,731,687,303,715,884,105,727 prime? Before you ask the Internet for an answer, can you consider how you might answer that question without a computer or even a digital calculator? In the 1800s French mathematician Édouard Lucas spent years proving that this 39-digit number was indeed prime. How did he do it? Lucas, who incidentally also designed […]
Launch HN: JSX Tool (YC F25) – A Browser Dev-Panel IDE for React
Hi HN, We’re Jamie & Dan, building JSX Tool (https://jsxtool.com) a new inspector/dev panel IDE that allows you to navigate to any line of your React project’s JSX with just a click and a command click to explore your render stack. Demo video: https://www.youtube.com/watch?v=JIIXvN7vhrs I’ve been writing React code for nearly a decade. Since I […]
The last-ever penny will be minted today in Philadelphia
The American penny passed away today after a prolonged illness. It was 238 years old. The last penny was minted Wednesday afternoon at the US Mint in Philadelphia, overseen by US Treasurer Brandon Beach. President Donald Trump announced via social media in February that he instructed the Mint to stop making the once-popular coin, citing […]
Kubernetes Is Your Private Cloud
We anchored our infrastructure on the public cloud because everyone else seemed to do it. Swipe a credit card, spin up managed everything, ship features. It felt easy—until the bill ballooned, incidents were gated behind opaque support tickets, and our roadmap got blocked by API rate limits we couldn’t change. Public cloud made our product […]
Waymo begins freeway rides for the public
Sixteen years ago, engineers working on the Google self-driving project conducted their first autonomous vehicle tests on the freeway that connects Silicon Valley to San Francisco. The company would eventually become Waymo, and autonomous vehicle testing would expand — fanning out to other cities. Eventually, the company launched commercial robotaxi services in Phoenix, San Francisco, […]
“One Student One Chip” Course Homepage
Live teaching sessions will start in September 2025. Stay tuned. If you find errors in the lab handouts or materials, or have questions or suggestions about the experiments, please contact Yu Zihao via email (yuzihao#ict.ac.cn). Learning Resources The Time column indicates estimated completion time in hours. Content marked with an estimated completion time of 2 […]
Learn Prolog Now
Learn Prolog Now! is an introductory course to programming in Prolog. The online version has been available since 2001, and now there is also a throughly revised version available in book form. We wanted to do two things with this course. First, we wanted to provide a text that was relatively self contained, a text […]
Show HN: I built a synth for my daughter
TLDR: I built a portable step-sequencer synthesizer for my daughter’s third birthday. It has four sliders that control four notes in a looping sequence. Slide up = higher pitch, slide down = lower. It includes: An onboard synth module + speaker Tempo, volume, scale, pitch, and instrument controls An OLED screen with visual feedback + […]
Ruby Symbols
Symbols and Why You Should Care# I should start, aptly, with the manual. A Symbol object represents a named identifier inside the Ruby interpreter. Okay, it’s a token of a sort, I think. I’ve been befuddled when seeing :name instead of name and I didn’t know what it was at first. I spent some time […]