Ti-84 Evo
Summary
The TI‑84 Evo is a graphing calculator marketed by Texas Instruments. It includes a one‑year limited warranty and access to TI‑Cares™ customer support. Educational resources are offered through classroom activities, a Workshop Loan Program for borrowing calculators during evaluations or workshops, and a TI Technology Rewards Program that lets users earn points redeemable for additional TI products and services. Visual assets associated with the product depict the Evo keypad and a series of “Derivative Slide” accessories in multiple colors (pink, mint, white, silver, teal, lavender), as well as screenshots of the fraction display on the TI‑84 Evo, TI‑84 CE, and TI‑84 Plus models. These elements emphasize the calculator’s hardware layout, optional accessories, and display capabilities.
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Community Discussion
Comments blend nostalgic appreciation for TI graphing calculators as early programming tools and social artifacts with criticism of their high price, limited features, and perceived monopoly in education. Many recall using TI‑Basic or assembly to create games and utilities, while newer models’ ARM hardware and Python support generate interest yet also skepticism about performance and relevance versus smartphones, online tools, and LLMs. Users call for more openness, lower‑cost alternatives, and features like RPN, but acknowledge the devices’ enduring cultural presence despite debates over their educational value.
Artemis II Photo Timeline
Summary
The page presents “FARTHER — 2027 Calendar,” a 13‑month collection featuring historic Artemis II mission photography printed on premium matte paper. The product description emphasizes that the calendar showcases a full year plus an additional month of images captured during the Artemis II flight, offering a visual timeline of the mission. Two visual placeholders are listed: Image 1 labeled “Current photo” and Image 2 labeled “Farther — 2027 Calendar,” each with corresponding alt‑text descriptors. No further technical specifications, pricing, or purchase details are provided. The content is limited to the title, brief product overview, and the two image references.
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Community Discussion
The discussion expresses strong enthusiasm for the timeline tool and related content, highlighting the usefulness of Hank Green’s tutorial, the appeal of navigating the images chronologically, and the striking visual impression of the moon’s scale. Positive remarks emphasize admiration for Green’s site, the role of Claude Code in enabling creative projects, and a nostalgic appreciation for the indie‑web aesthetic reminiscent of the early‑2000s. An additional light‑hearted comment praises a Nutella advertisement, reinforcing an overall upbeat and supportive tone.
New research suggests people can communicate and practice skills while dreaming
Summary
Research shows that specific forms of learning can occur during sleep. Anat Arzi’s 2014 study paired cigarette‑related and foul odors for sleeping participants; smokers subsequently cut consumption by over 30 %, outperforming those exposed while awake. Emma Peters (University of Bern) trained lucid‑dreamers to rehearse motor tasks (e.g., finger tapping, dart throwing) in REM sleep, and participants displayed greater post‑sleep improvement than controls, though dream environments remain uncontrolled. A larger collaboration led by Konkoly and Paller used EEG‑verified lucid dreaming to deliver yes/no questions and simple arithmetic, capturing responses via predefined eye‑movement signals. Some subjects recalled the queries upon waking, indicating “complex learning.” In a follow‑up published in *Neuroscience of Consciousness*, twenty lucid dreamers worked on puzzles linked to auditory cues across multiple nights, solving 42 % of dream‑presented puzzles versus 17 % of unrelated ones. Across these experiments, sleep‑stage selection (non‑dreaming vs. REM lucid) and external cueing appear critical for facilitating behavioral and cognitive changes without conscious awareness.
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Community Discussion
Comments converge on the idea that sleep and dreaming often yield insights, problem‑solving breakthroughs, and reinforced learning, with numerous personal anecdotes describing solutions emerging after rest or lucid dreams. Several contributors note the importance of relaxed, uninterrupted sleep and cite research on memory reactivation, though many express caution about overstating effects and question reproducibility. Opinions vary on the practicality of exploiting dreams for productivity, with some embracing it as a valuable tool and others skeptical of its reliability or wary of potential sleep disruption. Overall, the discussion reflects mixed enthusiasm tempered by scientific caution.
To Restore an Island Paradise, Add Fungi
Summary
Conservation on Palmyra Atoll—a U.S. Pacific territory—has removed invasive coconut palms and eradicated black rats, but full recovery of native Pisonia forests may require mycorrhizal fungi. A recent study (Current Biology) sampled soils beneath surviving Pisonias and identified rare, endemic mycorrhizal species and potential donor sites for fungal translocation to support seedling growth. Researchers argue that successful restoration must pair native plants with their native fungal partners, as fungi supply essential nutrients. The study links this plant‑fungus interaction to broader ecosystem functions: Pisonia trees provide nesting habitat for seabirds, whose guano fertilizes surrounding coral reefs, enhancing reef growth and sediment production that stabilizes island elevation against sea‑level rise. Disruption of any link—trees, fungi, seabirds, reefs—could undermine island resilience. The findings suggest integrating fungal inoculation into restoration protocols to reestablish the full ecological cascade on Palmyra and similar Pacific atolls.
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The smelly baby problem
Summary
- Dr. Benjamin Spock’s 1946 “Common Sense Book of Baby and Child Care” gave parents practical diaper advice, recommending cloth diapers, multiple daily changes, and washing methods; disposables comprised only ~1 % of U.S. diaper use, mainly for travel.
- After acquiring Charmin in 1957, Procter & Gamble created a disposable‑diaper research team. Initial designs failed; a successful one‑piece prototype (1959) used a rayon moisture barrier and achieved two‑thirds parent approval.
- Manufacturing required entirely new production lines; engineers solved glue‑drip, wadding‑dust, and equipment‑fouling problems to reach speeds of 400 diapers/minute.
- Pampers launched in 1961 but were too costly (≈10 ¢ each). Reducing price to ~5.5 ¢ required high‑volume production; national rollout began in 1966, reaching 42 % market share by 1973.
- Kimberly‑Clark entered with Kimbies, later re‑engineered as Huggies (1977), adding tape fasteners and elasticized crotch; Huggies and P&G’s premium lines (Luvs) commanded higher prices but captured market share amid inflation.
- Adoption of super‑absorbent polymers in the 1980s thinned diapers, cutting logistics costs and expanding shelf space.
- By the mid‑1990s disposables held ~95 % of the diaper market in the U.S., Canada, Japan, and most of Europe. Environmental proposals to ban or tax disposables failed due to low landfill presence (<2 %) and strong consumer preference.
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Community Discussion
The comments express overall appreciation for the article and a shared interest in diaper technology and parenting experiences. Readers discuss the practicality of disposable versus cloth diapers, noting convenience, cost, and environmental considerations, with many acknowledging the appeal of eco‑friendly options despite added effort. Observations about manufacturing complexities, historical changes, and cultural trends such as declining birth rates and adult‑diaper markets appear alongside personal anecdotes about vigilance, product preferences, and the role of diaper services. Sentiment is generally positive and reflective.
I'm Peter Roberts, immigration attorney who does work for YC and startups. AMA
Community Discussion
The comments collectively express strong curiosity and concern about U.S. immigration processes, focusing on green‑card maintenance, PERM and H‑1B fee changes, O‑1 and EB‑5 options, travel limits, and the impact of recent policy shifts on tech workers. Many users seek clarification on procedural details, potential risks, and timelines, while noting frustration with rising costs, longer processing times, and perceived stricter enforcement. Overall, the tone is pragmatic and advice‑seeking, with occasional apprehension about legal and financial implications of current immigration reforms.
Direct electrochemical black coffee quality appraisal using cyclic voltammetry
Summary
The cited literature outlines a multidisciplinary approach to evaluating coffee quality, emphasizing electrochemical techniques—particularly cyclic voltammetry (CV) and related voltammetric methods—for quantifying key constituents such as caffeine, chlorogenic acids, and overall antioxidant capacity. Studies demonstrate the use of various electrode materials (bare carbon, boron‑doped diamond, glassy carbon, carbon nanofibers, MWCNT‑modified surfaces) to achieve selective, simultaneous detection of caffeine and polyphenols. Complementary analytical strategies include near‑infrared spectroscopy, colorimetric devices, refractometry, and ion‑mobility mass spectrometry for assessing roast degree, brew strength, extraction yield, and sensory attributes. Research also addresses the influence of brewing parameters (temperature, particle size, brew ratio) on chemical extraction kinetics and flavor profiles across hot, cold, and espresso preparations. Collectively, these works establish CV‑based sensors as rapid, portable tools for coffee quality control, capable of correlating electrochemical signatures with sensory outcomes and physicochemical characteristics.
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Community Discussion
The comment proposes using “electrochemical quality appraisal” to evaluate black coffee, expressing curiosity about what an electrochemical analysis of coffee might entail. It references coffee expert James Hoffmann humorously, imagines a YouTube short featuring him, and mentions the idea of having an electrochemist test the coffee in a workplace breakroom. The overall tone is light‑hearted and speculative, focusing on the novelty of applying scientific methods to coffee assessment.
A Report on Burnout in Open Source Software Communities (2025) [pdf]
Community Discussion
The comments express frustration with the expectation that popular open‑source creators owe perpetual support, describing it as an unrealistic burden. Contributors cite repeated toxic interactions—harassment, spam, unsolicited demands, and misuse of their work—and criticize shallow metrics such as stars or download counts as unreliable indicators of impact. Many stress the need for clear personal boundaries and proactive strategies to handle abuse, while some mention developing tools to filter low‑quality contributions as a potential remedy. Overall, the sentiment is critical of entitlement and supportive of protective measures.
Lib0xc: A set of C standard library-adjacent APIs for safer systems programming
Summary
GitHub microsoft/lib0xc provides a C‑standard‑library‑adjacent set of APIs aimed at safer systems programming. Its concrete goals are to enable compilation with ‑Wall ‑Wextra ‑Werror and to encourage “‑Weverywhere”‑style warning coverage, making new warnings cause build failures. APIs are named as drop‑in replacements for standard functions, rely heavily on macros and the C preprocessor, and assume fixed‑size objects, avoiding dynamic allocation where possible. The library embraces Clang’s ‑fbounds‑safety extensions, using macros that annotate pointer bounds for source‑compatible code. Key modules include 0xc/std (standard extensions such as cursor‑based formatted output, context pointers, portable printf specifiers) and 0xc/sys (syslog, queue, errno, buffer objects, logging, panic handling). It targets macOS and Linux (arm64, x86_64) built with ‑std=gnu11 and Clang, producing a POSIX static library lib0xc.a. Custom runtimes can supply allocation, panic, buffer‑type, and log‑stream implementations via platform‑specific headers. The project is MIT‑licensed, accepts contributions under a Microsoft CLA, and follows Microsoft’s Open Source Code of Conduct.
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Community Discussion
The comments express overall enthusiasm for a library that codifies safer C practices, noting its potential to improve existing codebases and attract interest for study and integration. Several remarks seek clarification on incremental adoption with legacy code, Windows/MSVC compatibility, and support for features such as dynamically‑sized arrays. There is a recurring call for similar safety‑focused APIs to be incorporated into official language standards, alongside criticism of the library’s naming and curiosity about Microsoft’s involvement. The tone is largely positive, with questions centered on practical deployment and broader standardization.
Ask HN: Who is hiring? (May 2026)
Community Discussion
The postings collectively highlight a surge of hiring across technology sectors, especially AI, robotics, sustainability, and health‑fintech, with many roles emphasizing Python, TypeScript, Go, Rust and cloud or data‑engineer skills. Remote, hybrid and onsite options are common, and several companies stress high autonomy, fast‑paced development and impact‑driven missions such as climate mitigation, disease control or accessible diagnostics. Compensation varies widely, often including equity, and most listings request a reference to the source platform. Overall, the tone is informational and promotional, focusing on talent acquisition for growth‑oriented, mission‑centric startups.