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Coffee Extraction Mathematics: TDS, Yield, and the Brewing Control Chart
Photo: CEphoto, Uwe Aranas / Wikimedia Commons, CC BY-SA 3.0. Coffee extraction is the only food preparation in everyday life that has been rigorously characterized by industrial science, and the mathematics that define it are simpler than most people expect. ...
Coffee and Pregnancy: What Peer-Reviewed Research Says About Caffeine and Maternal Health
Photo: Ed Yourdon / Wikimedia Commons, CC BY-SA 2.0. The American College of Obstetricians and Gynecologists, after reviewing decades of research on caffeine consumption during pregnancy, recommends limiting caffeine intake to less than 200 milligrams per day ...
Coffee and Longevity: What the Large Cohort Studies Show
Coffee is one of the most studied beverages in human nutrition science, and the cumulative evidence from population studies covering more than a million participants converges on a remarkable finding: people who drink 2 to 3 cups of coffee per day have a meani...
Italian Coffee Heritage
The history, traditions, and ongoing cultural practice of Italian coffee — from Venice in the 1500s through Gaggia's lever espresso to the modern bar.
Japanese Coffee Heritage
The kissaten tradition, hand-drip precision, jazz cafés, third-wave specialty coffee, and the Japanese contribution to global coffee culture.
Ethiopian Coffee Heritage
The birthplace tradition: Kaldi, the jebena buna ceremony, Kaffa region origins, and the oldest continuously-practiced coffee culture in the world.
Italian Espresso Culture: From the Bar to the Bialetti
Photo: SomeDriftwood from Liverpool, England / Wikimedia Commons, CC BY 2.0. Italian espresso culture is one of the most distinctive coffee traditions in the world, defined as much by the social rituals around the cup as by what is in the cup itself. Italians ...
Japanese Kissaten: The Slow Coffee Tradition
A standard Japanese dictionary defines kissaten (喫茶店) as a shop that serves tea, sweets and light meals. Writers in English use the word for Japan's old-fashioned coffee shops. Japan's official industrial classification uses it more widely: its kissaten catego...
Ethiopian Coffee Ceremony: The Birthplace Tradition
Photo: Abyssinian cat / Wikimedia Commons, CC BY-SA 4.0. The Ethiopian coffee ceremony, called jebena buna in Amharic, is the oldest continuously practiced coffee tradition in the world, and it comes from the country where coffee itself was discovered. For Eth...
Café Yaucono: History of a Puerto Rican Coffee Brand
La Bombonera in Old San Juan, Puerto Rico, founded in 1902, photographed in 2007. Photo: picken / Wikimedia Commons, CC BY 2.0. Café Yaucono is a Puerto Rican coffee brand whose name echoes the town of Yauco. The name was created in 1914 by Tomás Prado, owner ...
Coffee and Cognitive Function: Memory, Focus, and Brain Health
Photo: nichd / Wikimedia Commons, CC BY 2.0. Coffee's effect on cognition is one of the most studied phenomena in neuroscience, and the research has produced findings far more interesting than the obvious "caffeine makes you alert." Caffeine increases dopamine...
Modern Experimental Coffee Processing: Anaerobic, Carbonic Maceration, and Beyond
Summary Coffee producers have long processed coffee in three main ways: washed, natural and honey. Since the 2010s, specialty producers have also experimented with controlled fermentation, especially in sealed, low-oxygen tanks. The best-known methods are anae...
Wet vs Dry Processing: The Two Original Coffee Methods
Wet vs Dry Processing: The Two Original Coffee Methods Before honey processing, anaerobic fermentation, or any modern processing variant existed, coffee was processed in just two ways: dry (also called natural) and wet (also called washed). These two methods a...
Coffee Roasting Levels: Light, Medium, Dark — and Why It Matters
Coffee Roasting Levels: Light, Medium, Dark — and Why It Matters Roast level is one of the three biggest variables that determine how coffee tastes — alongside origin and brewing method. Roasting transforms raw green coffee beans through carefully controlled h...
Coffee Grinder Burr Geometry: Conical vs Flat — Why It Matters
Summary A burr grinder crushes coffee between two hard, ridged surfaces called burrs. The two main burr shapes are conical, a cone turning inside a ring, and flat, two parallel rings facing each other. Measurements with laser particle analysers show that every...
AeroPress: The Travel Brewer's Complete Guide
AeroPress: The Travel Brewer's Complete Guide Photo: Bean Poet / Wikimedia Commons, CC BY-SA 2.0. The AeroPress is the most beloved coffee brewer of the modern era. Invented in 2005 by Stanford engineering professor Alan Adler — who also invented the Aerobie f...
Coffee Equipment Essentials
Encyclopedia entries on the essential tools for brewing exceptional coffee at home — scales, kettles, grinders, and accessories that change what is possible in the cup.
French Press Complete
Encyclopedia entries on the French press immersion brewer — history, technique, recipes, and the modern methods that produce a clean, sweet cup.