Hacker News with Generative AI: Coffee

I Heart Cardioids (divisbyzero.com)
Roll a circle around another circle of the same radius. A marked point on the first circle traces a curve called a cardioid. (In the figure below we rolled the orange circle around the red circle to draw the green cardioid.) This beautiful heart-shaped curve shows up in some of the most unexpected places. Grab a cup of coffee and we’ll show you some.

Mathematics, Geometry, Visualizations, Coffee

6 points by thunderbong 9 days ago | 0 comments

Why are coffee stains darker at the edges? (why.is)
There are many things around us that are so taken for granted that it never occurs to us to give them a second thought until we look a little closer. Coffee stains are one such thing. When coffee dries it leaves stains that are dark at the edges and lighter inside. The explanation may not be obvious but it is in fact rather simple.

Science, Coffee, Physics

135 points by michalpleban 14 days ago | 45 comments

Italian coffee pot maker Bialetti to be sold to Chinese business NUO Capital (theguardian.com)
Bialetti, the Italian manufacturer of the famed stove-top moka coffee pot, has struck a deal to sell the business to an investment vehicle owned by a Chinese tycoon.

Business, Acquisitions, China, Italy, Coffee

11 points by ValentineC 36 days ago | 1 comments

Fewer beans = great coffee if you get the pour height right (arstechnica.com)
Pour-over coffee is made by flowing a strong, laminar water jet through a bed of ground coffee beans.

Coffee, Science, Food, Brewing

9 points by PaulHoule 38 days ago | 3 comments

Why drinking coffee in Iran has become so complicated (adelbordbari.github.io)
It all started with a sarcastic jab in a chat: “You shouldn’t be more Catholic than the Pope. You go to order a coffee, and the guy’s like, ‘From Kenyan farms or Brazil?’ It’s like going to Italy for ghormeh sabzi, and they ask if you want the herbs from Bostanabad or Tuyserkan. Come on—just give us an espresso so we can move on with our lives :))”

Iran, Culture, Coffee, Social Commentary

137 points by imnitwit 39 days ago | 147 comments

Fridge or Freezer: Where Should You Store Your Coffee? (wordpress.com)
The debate on coffee storage resurfaces from time to time, although, much like Galileo’s discovery, few skeptics remain. Yes, the Earth orbits the Sun, and coffee is best stored in the freezer, in whole beans and vacuum-sealed. If you have a freezer at -70°C, you could even enjoy it a century from now.

Food Storage, Coffee, Science

5 points by andrewstetsenko 40 days ago | 1 comments

Coffee Too Weak? Try This (publishing.aip.org)
WASHINGTON, April 8, 2025 – Tens of billions of kilograms of coffee are consumed around the world each year. However, due to its very specific agricultural needs, coffee can be difficult to cultivate, and ongoing climate change threatens its growth.

Coffee, Climate Change, Agriculture

21 points by paulpauper 43 days ago | 1 comments

Coffea stenophylla: A forgotten bean that could save coffee from extinction (smithsonianmag.com)
One leading botanist is scouring remote corners of the earth to find new species that could keep our mugs full

Coffee, Botany, Climate Change, Extinction, Agriculture

170 points by derbOac 53 days ago | 138 comments

Cholesterol-elevating substances found in coffee from machines at work (medicalxpress.com)
The coffee from most of the coffee machines in workplaces contains relatively high levels of cholesterol-elevating substances.

Health, Coffee, Workplace

18 points by bikenaga 64 days ago | 3 comments

Scientists Just Discovered a Health Benefit of Coffee (foodandwine.com)
Recent research found a surprising link between coffee and gut health, and the findings are eye-opening.

Health, Coffee, Science, Gut Health

5 points by teleforce 71 days ago | 0 comments

South Sudan farmers pin hopes on rare climate-resistant coffee (aljazeera.com)
Discovered more than a century ago, excelsa coffee is exciting cash-strapped locals and drawing interest globally.

Agriculture, South Sudan, Climate Change, Coffee

4 points by mooreds 78 days ago | 1 comments

Anti-Schelling points and waiting for my barista-made coffee (interconnected.org)
The phase space of coffee is large enough that many people can wait for their orders without collision, and that means the barista doesn’t need to take names, and you don’t need to memorise your place in line.

Coffee, Queueing Theory, Social Dynamics

26 points by Tomte 79 days ago | 28 comments

Coffee Prices at a 50 year high (nytimes.com)
Coffee Prices Are at a 50-Year High. Producers Aren’t Celebrating.

Coffee, Economics, Agriculture

15 points by dschol 90 days ago | 0 comments

Hive Roaster Handheld Smoke Incinerating Coffee Roaster (hiveroaster.com)
Cascabel - Handheld Home Coffee Roaster. PREORDER HERE

Coffee, Hardware, Gadgets, Preorders

14 points by p4bl0 90 days ago | 6 comments

MIT students decode the science behind the perfect cup (news.mit.edu)
Undergraduate class blends science, hands-on experimentation, and a love for coffee to fuel curiosity.

Science, Coffee, Education, MIT

4 points by azinman2 134 days ago | 0 comments

Morning coffee may protect the heart better (eurekalert.org)
People who drink coffee in the morning have a lower risk of dying from cardiovascular disease and a lower overall mortality risk compared to all-day coffee drinkers, according to research published in the European Heart Journal [1] today (Wednesday).

Health, Coffee, Heart Disease, Research

7 points by cratermoon 137 days ago | 2 comments

Coffee drinkers reap health boost – but only if they do it in the morning (theguardian.com)
People who get their coffee hit in the morning reap benefits that are not seen in those who have shots later in the day, according to the first major study into the health benefits of the drink at different times.

Health, Coffee, Science

6 points by zeristor 137 days ago | 3 comments

Show HN: I designed an espresso machine and coffee grinder (velofuso.com)

Hardware, Design, Coffee, Espresso Machines

797 points by smeeeeeeeeeeeee 163 days ago | 477 comments

Kenya and "the decline of the greatest coffee" (2021) (christopherferan.com)
During one of his “yes or no” Instagram Q&As, Scott Rao lamented the declining quality of Kenyan coffees over the last three years—a sentiment I’ve heard echoed by buyers across Europe, the US, and Australia.

Coffee, Kenya

214 points by sebg 174 days ago | 238 comments

Ask HN: How do you make your coffee? (ycombinator.com)
I recently bought an AeroPress and have been enjoying lighter roasts with it, something I didn't think I'd ever enjoy. Before that, I usually preferred a dark roast french press, or a Nespresso if I didn't feel like making coffee. Black, no cream or sugar.

Coffee, Preferences, Methods, Tools

9 points by ezekg 175 days ago | 28 comments

Moderate alcohol,oily fish,cereal lower arthritis risk; tea,coffee may raise it (medicalxpress.com)
Moderate alcohol intake and eating more fruit, oily fish and cereals are linked to lower risk of rheumatoid arthritis, while tea and coffee may be linked to increased risk, new research shows.

Health, Nutrition, Arthritis, Coffee, Tea

4 points by bikenaga 176 days ago | 0 comments

Jazz Kissa (wikipedia.org)
Jazz kissa (Japanese: ジャズ喫茶), sometimes transliterated as jazu kissa, are cafés that specialise in the playing and appreciation of recorded jazz music.

Music, Japan, Culture, History, Coffee

68 points by simonebrunozzi 178 days ago | 36 comments

Coffee drinking habits may greatly impact makeup of gut biome (medicalxpress.com)
A large international team of medical researchers has found that people who drink coffee regularly have much more of one type of gut bacteria than people who do not.

Coffee, Gut Microbiome, Health, Science, Nutrition

48 points by Gaishan 179 days ago | 24 comments

Coffee Plants of the World (sca.coffee)
Coffea arabica, which is indigenous to Ethiopia and some neighboring lands, first was transported out of its homeland into neighboring Yemen. From Yemen, coffee was transported around the world. The coffees that we call typicas today originated from plants that left Yemen and were taken to Java and outlying Islands, possibly by the Dutch, possibly with some transport by the mythical monk Baba Budan. The coffees we call Bourbon today stem from plants transported to Ile Bourbon with the French.

Coffee, History, Botany, Agriculture

6 points by andrewstetsenko 192 days ago | 0 comments

Company sues customer for reverse-engineering knockoff Keurig K-cup coffee pods (startribune.com)
In 2014, a Minnesota tech company helped a generic coffee-pod maker crack Keurig’s top-secret ink signature so its knockoff pods could work with the newest versions of the popular single-serve coffee machines.

Lawsuits, Intellectual Property, Coffee, Reverse Engineering, Consumer Products

3 points by walterbell 231 days ago | 0 comments

Drinking 3 cups of coffee linked to preventing multiple diseases (studyfinds.org)
WASHINGTON — A new study suggests that your morning brew might be doing more than just perking you up — it could be protecting you from a range of serious heart conditions.

Health, Coffee, Disease Prevention, Heart Health, Studies

41 points by Stratoscope 242 days ago | 52 comments

Coffee Stats – Maximize Caffeine Intake and Get to Bed at Night (github.com/Eliya-G)
This project was built to answer a question many of us have. Should I have another cup of coffee?

Coffee, Health, Data Science, Programming

187 points by Blaze854 245 days ago | 141 comments

You are how you resist (medium.com)
If you live in Amsterdam, you’ve probably seen a coffee chain called Cafecito. Decent coffee, minimalist typographic logo, snowy-white walls, clean geometry of interior objects, perfectly lined up branded merchandise on wooden shelves. I hate it. It is less authentic than Starbucks on a train station. Cafecito is so outstandingly unremarkable that its facelessness feels to me like a personal insult.

Coffee, Design, Personal Opinion

4 points by ozornin 250 days ago | 0 comments

DiyPresso: DIY Espresso Machine (diypresso.com)
Discover the world's first DIY espresso machine. With our easy to understand step-by-step manual, all you need is a screwdriver and a wrench to assemble your very own espresso maker. Dive into the process of building your own diyPresso and on the go, learn how everything works.