

The Science of Coffee
James Harper
The Science of Coffee is a journey into coffee’s hidden microscopic secrets to help you make even better coffee at home.
Documentary maker and coffee professional James Harper travels the world and speaks with leading coffee scientists to help you appreciate coffee more deeply.
You are going to get taken into the science of water, coffee extraction, plant genetics, espresso technology, latte foam, sonic seasoning, our sense of taste and smell, organic farming, roasting, grinding and freshness, and how to think like a scientist.
Press the Subscribe button so you don’t miss future episodes!
The Science of Coffee is a spin-off series from James Harper’s documentary podcast Filter Stories.
Follow James on Instagram: https://bit.ly/2Mlkk0O
Listen to Filter Stories: https://bit.ly/3ajoT5
Documentary maker and coffee professional James Harper travels the world and speaks with leading coffee scientists to help you appreciate coffee more deeply.
You are going to get taken into the science of water, coffee extraction, plant genetics, espresso technology, latte foam, sonic seasoning, our sense of taste and smell, organic farming, roasting, grinding and freshness, and how to think like a scientist.
Press the Subscribe button so you don’t miss future episodes!
The Science of Coffee is a spin-off series from James Harper’s documentary podcast Filter Stories.
Follow James on Instagram: https://bit.ly/2Mlkk0O
Listen to Filter Stories: https://bit.ly/3ajoT5
Episodes
Mentioned books

Feb 16, 2025 • 47min
Fruit juice or creamy almonds? Your guide to controlling cold brew flavors
Discover the fascinating science of cold brew coffee, where water and coffee interact in unique ways. Learn how to transform your brews from fruity to nutty with specific brewing techniques. Delve into the distinct flavor profiles of different bean origins, like Brazilian and Kenyan. Get expert tips on brewing cold brew at home, including the right ratios and equipment to use. This discussion reveals the complexities behind crafting a perfect cup, making cold brew an art form all its own.

10 snips
Feb 3, 2025 • 45min
Hot vs Cold: The science behind temperature and taste
Discover the striking flavor differences between cold brew and traditional hot coffee. A personal journey reveals how cold brewing can unlock floral notes that hot methods miss. Experts explain the science behind why certain flavors shine in lower temperatures while bitterness fades. Misconceptions are debunked as listeners explore the unique characteristics of cold brew, its complex brewing techniques, and the importance of aroma in flavor perception. Join the conversation about the magical transformation that temperature brings to every cup.

Jan 27, 2025 • 2min
Introducing: Season 3 of The Science of Coffee
We’re back with another series of The Science of Coffee—and this time we’re diving even deeper into coffee’s hidden microscopic secrets!
Over the past year, narrative audio producer and coffee professional James Harper has scoured academic journals, ventured deep into coffee farms, and conducted bold tasting experiments.
Now, he’s weaving those discoveries into captivating audio stories that reveal why coffee tastes the way it does—and how we can make it taste even better.
In this new series, you’ll learn about cold brew extraction science, explore innovations in roasting, and follow the shifting business models that shape farmers’ livelihoods. You’ll also take a journey through commodity vs. specialty supply chains and examine the historical, sociological, and philosophical perspectives that define what “specialty coffee” truly means.
Press the “Subscribe” button so you don’t miss an episode!
https://bit.ly/3TdDnHO
For more coffee science and behind-the-scenes content, follow James on Instagram @filterstoriespodcast.
https://bit.ly/2Mlkk0O
The Science of Coffee is a spin-off series from James Harper’s documentary podcast, Filter Stories.
https://bit.ly/3ajoT5e
Season 3 is made possible by these leading coffee organizations:
The Coffee Quest | BWT | TODDY | Algrano | Probat

May 6, 2024 • 47min
Freshness and Grinding, Part 2: How grinders work deep inside
Take a deep dive into the world of coffee grinders, where tiny changes can create massive flavor differences. Explore the importance of particle sizes on taste, comparing high-end vs. budget grinders. Learn the delicate balance needed for optimal flavor extraction and the significance of consistency for a great cup of coffee.

Apr 22, 2024 • 50min
Freshness and Grinding, Part 1: Protecting your coffee’s flavours
Delve into the science of coffee freshness and grinding in this podcast. Discover how diffusion and oxidation affect flavors. Learn to store coffee grounds for optimal freshness. Explore blind taste tests and the mystery of coffee aging. Uncover strategies to preserve coffee freshness and challenge the belief that fresher coffee is always better.

Apr 8, 2024 • 55min
What Is Good Science? Part 2: How to think like a scientist
Explore the world of coffee brewing and the impact of scientific thinking. Dive into the controversy of coffee slurping and its effect on flavor. Discover the importance of good evidence in coffee theories and experiments. Learn about the role of water in enhancing coffee flavor profiles, with a focus on magnesium. Delve into the complexities of water chemistry and its influence on coffee taste.

Mar 25, 2024 • 46min
What Is Good Science? Part 1: How to brew coffee like a scientist
Debunking the filter paper rinsing myth in coffee brewing with a scientific approach. Exploring sensory science methodologies and biases in evaluating coffee tastes. Reflecting on consumer perception, Cup Tasters Championship, and challenges of consistent coffee brewing. Delving into scientific precision in coffee brewing experiments and improving testing parameters for statistical reliability.

Mar 13, 2024 • 41min
Organic Coffee, Part 2: Why don’t we see more organic coffee farms?
Discover the incredible journey of organic coffee farming in Central America. Learn about the vibrant ecosystems that thrive without agrochemicals and the challenges that hinder the growth of organic farms. Uncover the inspiring story of the RAOS cooperative and the dedication of its founders to overcome obstacles. Explore how collaboration and community efforts have transformed local farming practices while enhancing farmer livelihoods. This deep dive into organic coffee reveals both the struggles and the beauty of sustainable agriculture.

Feb 26, 2024 • 39min
Organic Coffee, Part 1: The magic of soil
Soil health is deteriorating rapidly due to conventional coffee farming practices. A trip to Honduras reveals the innovative methods of Don Rufino, a master of organic coffee, who enriches his soil with microorganisms and a variety of shade trees. The episode highlights the stark contrast between organic and chemical methods, emphasizing the importance of sustainable agriculture. Listeners learn about the trials of transitioning to organic farming and the captivating hidden world of soil ecosystems that nurture healthy coffee plants.

Feb 12, 2024 • 46min
Coffee Roasting, Part 2: Roasting made easy
Discover the intricacies of coffee roasting with insights on temperature, time, and technology. Learn how smart technologies are revolutionizing the roasting process. Explore the challenges in achieving consistent batch-to-batch roasting results and the innovative solutions offered by ROEST's P3000 roaster.