The electromechanical angle computer inside the B-52 bomber's star tracker

139 NelsonMinar 2026-04-18 16:59:23 UTC righto.com Llama Share 42

Before GPS, aircraft navigated using celestial navigation, which was automated in the 1960s with the development of the Astro Compass system that used an electromechanical analog computer called the Angle Computer. The Angle Computer physically modeled the celestial sphere to solve the navigational triangle and provide accurate heading and position information to the aircraft navigator.

Migrating from DigitalOcean to Hetzner

536 yusufusta 2026-04-18 13:59:23 UTC isayeter.com Llama Share 302

A company migrated from DigitalOcean to Hetzner dedicated servers with zero downtime, saving $14,388 per year. The migration involved six phases, including MySQL replication, DNS TTL reduction, and reverse proxy setup.

Young sons of legendary U.S. marshal ride horseback from Oklahoma to New York

11 mhb 2026-04-18 19:22:23 UTC texascooppower.com Llama Share 2

Two brothers, Bud and Temple Abernathy, aged 10 and 6, rode their horses over 2,000 miles from Oklahoma to New York City in 1910. Their father, a US marshal, helped plan the route and joined them in New York for a parade welcoming President Roosevelt home.

State of Kdenlive

270 f_r_d 2026-04-18 11:59:23 UTC kdenlive.org Llama Share 89

The Kdenlive team made significant progress in 2025, releasing new features, bug fixes, and improvements to the user interface, with a focus on stability and community support. The team is now looking ahead to upcoming features, including 10/12 bit color support, playback optimizations, and OpenFX support, and is grateful for community contributions and donations that enable continued development.

Opus 4.7 to 4.6 Inflation is ~45%

299 anabranch 2026-04-18 16:59:23 UTC tokens.billchambers.me Full Share 313

Anonymous request-token comparisons from the community, showing how Opus 4.6 and Opus 4.7 differ on real inputs Open source · stored rows contain anonymous submission IDs onlyNot affiliated with or endorsed by Anthropic.

Show HN: MDV – a Markdown superset for docs, dashboards, and slides with data

44 drasim 2026-04-18 15:59:23 UTC github.com/drasimwagan Llama Share 13

The user writes documents, dashboards, and slides in a Markdown superset using a theme and named styles. The rendered output is self-contained HTML and PDF, and can be previewed live in VS Code with auto-reload.

Scientists discover "cleaner ants" that groom giant ants in Arizona desert

47 t-3 2026-04-18 15:59:23 UTC sciencedaily.com Llama Share 23

Scientists discovered a unique partnership in Arizona's desert where tiny cone ants act as "cleaners" for larger harvester ants, licking and nibbling their bodies. This behavior is the first known example of one ant species cleaning a much larger ant, similar to cleaner fish in the ocean.

Michael Rabin has died

331 tkhattra 2026-04-18 06:59:23 UTC en.wikipedia.org Llama Share 70

Michael Oser Rabin was an Israeli mathematician and computer scientist who co-received the 1976 ACM Turing Award for work on computational complexity. He made significant contributions to computer science, including the Miller-Rabin primality test and the Rabin-Karp string search algorithm.

Sumida Aquarium Posts 2026 Penguin Relationship Chart, with Drama and Breakups

110 Lwrless 2026-04-18 12:59:23 UTC sumida-aquarium.com Full Share 5

The 2026 edition of our penguins relationship chart is finally here! It's fun, adorable, and as complicated as always!

Fuzix OS

47 DeathArrow 2026-04-18 15:59:23 UTC fuzix.org Llama Share 20

Fuzix kernel 0.4 has bug fixes, improved interfaces, and a reworked networking layer for modularity. It supports various 8-bit and 16-bit processors.

Graphs That Explain the State of AI in 2026

29 bryanrasmussen 2026-04-18 17:59:23 UTC spectrum.ieee.org Llama Share 20

AI capabilities continue to accelerate with notable model releases and increased investment, but public perception remains mixed with concerns over AI's impact on society and job displacement. The 2026 Stanford AI Index report highlights trends in AI adoption, investment, and public perception, with varying results depending on the task or question at hand.

UpCodes (YC S17) Is Hiring SDRs to Help Make Construction More Productive

0 2026-04-18 17:59:23 UTC up.codes Full Share

We’re looking for talented and motivated people who can help us build easy-to-use compliance and product research tools. Learn about our culture and explore open positions.

Traders placed over $1B in perfectly timed bets on the Iran war

41 trocado 2026-04-18 18:59:23 UTC theguardian.com Llama Share 34

Large online betting markets like Polymarket and Kalshi allow bets on news events, raising concerns of insider trading. Regulators face challenges in enforcing laws due to the complexity of the issue and the use of anonymized trading platforms.

80386 Memory Pipeline

48 wicket 2026-04-18 13:59:23 UTC nand2mario.github.io Llama Share 10

The 80386's memory pipeline is a carefully engineered combination of latency-hiding techniques that allows protected virtual memory to perform close to physical memory, making it a practical foundation for serious PC operating systems. The FPGA 386 core's memory pipeline design aims to map the historical 386 memory pipeline to modern FPGAs while achieving high Fmax and low CPI, with ...

Amiga Graphics Archive

210 sph 2026-04-18 06:59:23 UTC amiga.lychesis.net Full Share 56

Launched in 1985 the Commodore Amiga boasted graphics capabilities that were unsurpassed for it's time. It featured an intricate collection of custom chips that enabled it to do things that, until then, had been impossible to achieve with other personal computers. This site is dedicated to graphics made with or for the Commodore Amiga home computer.

Understanding the FFT Algorithm (2013)

24 peter_d_sherman 2026-04-18 15:59:23 UTC jakevdp.github.io Llama Share 2

The Fast Fourier Transform (FFT) is a fast algorithm to compute the Discrete Fourier Transform (DFT) with a time complexity of O[N log N]. It was introduced by JW Cooley and John Tukey in 1965 and exploits symmetries in the DFT computation to achieve this speedup.

Category Theory Illustrated – Orders

200 boris_m 2026-04-18 06:59:23 UTC abuseofnotation.github.io Llama Share 56

Orders are sets of elements with a binary relation that obeys laws of reflexivity, transitivity, antisymmetry, and totality, defining linear and partial orders. Removing laws from orders results in different structures, such as preorders and equivalence relations, which have various applications in mathematics and computer science.

Show HN: Remoroo. trying to fix memory in long-running coding agents

4 adhamghazali 2026-04-18 18:59:23 UTC remoroo.com Full Share 0

Remoroo runs autonomous experiments on your code — locally, overnight. It edits, trains, evaluates, keeps or reverts. You wake up to a better model.

4-bit floating point FP4

6 chmaynard 2026-04-18 17:59:23 UTC johndcook.com Prefix Share 1

In ancient times, floating point numbers were stored in 32 bits. Then somewhere along the way 64 bits became standard. The C programming language retains the ancient lore, using float to refer to a 32-bit floating point number and double to refer to a floating point number with double the number of bits. Python simply uses float to refer to the most common floating point format, which C calls ...

Headless Everything for Personal AI

6 markusw 2026-04-18 17:59:23 UTC interconnected.org Prefix Share 1

It’s pretty clear that apps and services are all going to have to go headless: that is, they will have to provide access and tools for personal AI agents without any of the visual UI that us humans use today. By services I mean things like: getting a new passport; finding and booking a hotel or a flight; managing your bank account; shopping for t-shirts with a minimum cotton weight from ...

It's OK to compare floating-points for equality

145 coinfused 2026-04-18 09:59:23 UTC lisyarus.github.io Llama Share 96

The user discusses the limitations and pitfalls of using epsilon-comparison for floating-point numbers, arguing that it's often a bad solution and can lead to unexpected behavior and bugs. They provide several examples of how to handle floating-point comparisons in a more robust and reliable way, such as using acceptance radii, analyzing the problem, and avoiding epsilons altogether.

Why Japan has such good railways

235 RickJWagner 2026-04-18 12:59:23 UTC worksinprogress.co Llama Share 243

Japan's railway system excels due to good public policy, business structure, and land use rules, not cultural factors. Its unique model of private companies building cities and capturing value from real estate and commercial side businesses has contributed to its success.

Show HN: I made a calculator that works over disjoint sets of intervals

268 fouronnes3 2026-04-18 03:59:23 UTC victorpoughon.github.io Llama Share 47

This calculator uses Interval Union Arithmetic to compute results that contain the true value, supporting division by intervals with zero and remaining closed. It interprets numbers as intervals with outward rounding over IEEE 754 double precision floats.

Measuring Claude 4.7's tokenizer costs

678 aray07 2026-04-17 19:59:23 UTC claudecodecamp.com Llama Share 474

Anthropic's new Claude Opus 4.7 tokenizer uses 1.3-1.45x more tokens than 4.6. This results in a 20-30% higher per-session cost for a small but real improvement in instruction following.

All 12 moonwalkers had "lunar hay fever" from dust smelling like gunpowder (2018)

429 cybermango 2026-04-17 19:59:23 UTC esa.int Llama Share 243

Lunar dust is toxic and causes health issues in humans due to its sharp, abrasive particles and electrostatic charge. Researchers are studying the dust to estimate the risk and develop protective measures for future lunar missions.

I’m spending months coding the old way

319 evakhoury 2026-04-17 20:59:23 UTC miguelconner.substack.com Llama Share 305

The author is on a 6-week retreat at the Recurse Center to focus on coding without AI, learn Python, and understand computers better. They plan to train an LLM from scratch and improve their programming skills.

The USDA's gardening zones have shifted. (Interactive app and map) (2024)

46 nuke-web3 2026-04-18 16:59:23 UTC apps.npr.org Llama Share 5

The USDA plant hardiness zone map has been updated to reflect warmer winter temperatures, but it doesn't account for other factors like summer heat and microclimates, making it only a partial guide for gardeners. Local nurseries, botanical gardens, and cooperative extension services can provide more specific advice on plant survival and growth in your area.

The quiet disappearance of the free-range childhood

140 sylvainkalache 2026-04-18 11:59:23 UTC bigthink.com Llama Share 152

Mallerie and Christopher's 6-year-old son was investigated for neglect after riding his scooter to a nearby playground unsupervised. A new Georgia law, "reasonable childhood independence," aims to prevent such investigations by setting a higher bar for neglect.

Towards trust in Emacs

165 eshelyaron 2026-04-18 01:59:23 UTC eshelyaron.com Llama Share 25

Emacs 30 introduced a trust system to prevent arbitrary code execution, but it causes friction by disabling features for untrusted files. trust-manager is a new package that grants trust just-in-time with minimal friction.

A Dumb Introduction to Z3 (2025)

55 y1n0 2026-04-18 10:59:23 UTC ar-ms.me Llama Share 24

The user is learning to use solvers, specifically Z3, to solve constraint problems in Rust, and is sharing their experience and understanding of the concepts and API. They have successfully used Z3 to solve various problems, including the Coin Change problem and a Sudoku, and are exploring its capabilities and limitations.