Published: 2025-03-18 | Origin: Hacker News

Flying model rockets offers students a safe and cost-effective way to learn about forces in motion, specifically weight, thrust, lift, and drag. Among different types of model rockets, the whoosh rocket is a variation developed by Roger Storm and Mark Skor, using a two-liter soda bottle as its frame. Unlike standard water rockets, which use pressurized water for propulsion, whoosh rockets utilize a lighter combustible alcohol-air mixture. This results in a lower thrust generation and a flight pattern resembling ballistic, usually

Published: 2025-03-18 | Origin: Hacker News

The content promotes a service called BlueMigrate, which allows users to import their tweets to Bluesky while retaining the original dates. It provides a link for easy access to the service. Additionally, it mentions an opportunity to increase profile visibility by being featured on their homepage for $9.99 per week.

Published: 2025-03-18 | Origin: /r/ruby

The content discusses the concept of presence tracking in applications, highlighting its significance in establishing user connectivity. Irina Nazarova, the CEO, emphasizes how improved communication, akin to transparency in online status indicators, can enhance user experience. The article introduces a seamless method to implement user presence tracking in Hotwire applications using AnyCable. It references how presence tracking has been a long-standing feature in digital applications and suggests that every modern app could benefit from online awareness capabilities. The piece intends to guide users in adding this

Published: 2025-03-18 | Origin: Hacker News

The author reflects on their experience with Pebble smartwatches, noting the challenges of creating a smartwatch app for iOS compared to Android, a situation that has worsened over the past eight years. They set expectations for the upcoming iOS app, indicating it will lack the full functionality available to Apple Watch users, especially in areas like messaging and notifications for third-party smartwatches. Recalling their efforts in 2015 to enable messaging from Pebble devices, the author mentions a complicated partnership with

Published: 2025-03-18 | Origin: Hacker News

The author has compiled a comprehensive 300+ page book based on lessons learned from a decade of experience in founding and working at hardware startups. The book's Table of Contents includes topics such as planning a product, component selection, prototyping, design, cost engineering, fabrication, testing, building a lab, troubleshooting, and effective demo techniques. The book is available for free as a digital download or for $39 as a physical copy. More information can be found on the book's website: http://

Published: 2025-03-18 | Origin: Hacker News

Two new smartwatches running open source PebbleOS are being launched, compatible with thousands of Pebble apps. They are available for pre-order only at store.rePebble.com, with the Duo priced at $149 (shipping in July) and the Core Time 2 at $225 (shipping in December). The Duo resembles the Pebble 2 and includes improvements, while the Core Time 2 is a more advanced version of what Pebble Time 2 could have been. Both watches feature

Published: 2025-03-18 | Origin: /r/programming

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Published: 2025-03-18 | Origin: /r/programming

The author, who develops an AI code review tool, asserts that AI cannot replace human code review, now or in the foreseeable future. Despite the proliferation of AI tools for code generation and review, he expresses concern about the implications of their growing use. While code generation can be rapidly tested and verified through an iterative process, code review is inherently more complex and nuanced. The author invites readers to explore AI code review tools, but ultimately emphasizes the irreplaceable value of human engineers in the review process.

Published: 2025-03-18 | Origin: /r/programming

Crunchy Data Warehouse is introduced as a next-generation, Postgres-native data warehouse. This article by Craig Kerstiens discusses the Citus extension, which is one of the most advanced Postgres extensions. Citus enables Postgres to function as a sharded, distributed, and horizontally scalable database, specifically tailored for certain applications. The article highlights two main use cases where Citus excels: multitenant or SaaS applications. In such applications, tenant data is kept separate, ensuring that no data

Published: 2025-03-18 | Origin: /r/ruby

The content announces a podcast series featuring new episodes on the first Tuesday of each month, where topics include Ruby, Rails, JavaScript, and more. Each episode addresses three main questions: what participants are working on, what's blocking them, and something cool to share. The latest episode features Adam Watham, the creator of Tailwind CSS, discussing the framework's journey since its 2017 inception, its recent rebranding to Tailwind Plus, and the integration of Tailwind UI into its ecosystem.

Published: 2025-03-18 | Origin: /r/programming

The author shares several tips for improving work with PostgreSQL databases, highlighting small practices that collectively enhance usability. Key points include: 1. **UUIDs**: Despite their downsides, using UUIDs is generally beneficial. 2. **Timestamps**: Always include `created_at` and `updated_at` columns in tables for record history, and use triggers to automatically manage the `updated_at` value. 3. **Foreign Key Constraints**: Implement foreign key constraints with `ON UPDATE RESTRICT

Published: 2025-03-18 | Origin: Hacker News

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Published: 2025-03-18 | Origin: /r/programming

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Published: 2025-03-18 | Origin: /r/programming

The author posits that the next phase of AI development will focus on models themselves as products rather than applications built on them. This shift may disrupt the application layer, which investors have primarily supported. Recent examples of this new generation of models include OpenAI's DeepResearch and Claude Sonnet 3.7. DeepResearch is highlighted as a unique research language model capable of performing end-to-end search tasks, unlike standard language models or chatbots. It utilizes its own browsing capabilities—such as searching and

Published: 2025-03-18 | Origin: Hacker News

Niki, also known as @nikitonsky, aims to integrate databases into browsers as part of their work with Instant. They recognize the modern browser as a complex operating system and emphasize the challenges web developers face with data synchronization. Despite having seen many data-fetching tools like XHR, fetch, REST, and GraphQL over the years, Niki points out that these are low-level solutions that only handle initial data retrieval, not ongoing synchronization as data changes over time. They stress that

Published: 2025-03-18 | Origin: Hacker News

The content discusses a method for designing type checkers derived from behavioral specifications through equational reasoning. It highlights the simplification of calculations using an algebraic approach based on fold fusion, as well as enhancements made possible by a constraint-based method for solving and composing fusion preconditions. The methodology is demonstrated through three progressively complex examples: a simple expression language, an extension that includes exceptions, and a variant of the lambda calculus. The work is categorized under Type Systems and Formal Verification, with relevant tags including Program

Published: 2025-03-18 | Origin: Hacker News

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Published: 2025-03-18 | Origin: Hacker News

Vasek Rozhon's blog highlights the release of a video on zero-knowledge proofs, specifically focusing on an algorithm related to graph coloring. The creation of the video was more challenging than anticipated, as it required careful consideration of depth and relevant applications. The video aims to provide a broad overview, encouraging viewers to explore more detailed resources, such as a classic book on cryptography. Rozhon mentions that many complex problems can be reduced to 3-coloring, which ties into previous discussions on

Published: 2025-03-17 | Origin: Hacker News

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Published: 2025-03-17 | Origin: Hacker News

GIMP 3.0 has finally been released after seven years of development by a dedicated community. This new version offers enhanced features for easier and faster editing. Key highlights include: - Non-destructive editing for commonly-used filters with real-time on-canvas previews. - Improved file exchange capabilities, including support for BC7 DDS files and enhanced PSD export. - Automatic layer expansion with paint tools, making drawing easier. - Improved text styling options, allowing for editable text with outlines, shadows, and more