Filter Stories
By James Harper
Coffee stories with an extra shot of history and science. Filter Stories is a podcast revealing coffee’s hidden microscopic secrets, its powerful past, and how your choice of beans impacts tens of millions of people.
See the behind-the-scenes stories on Instagram @filterstoriespodcast.
If you haven’t already, please subscribe to the show and review us on Apple Podcasts and Spotify!
See the behind-the-scenes stories on Instagram @filterstoriespodcast.
If you haven’t already, please subscribe to the show and review us on Apple Podcasts and Spotify!
Latest episode
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The Speed of Heat: How to roast more coffee, faster!
To roast coffee faster, you need to turn up the heat….right? No! In this episode, we explore the three powerful methods of heat transfer that revolutionised roasting. We’ll journey from humble beginnings—when roasting three kilos took half an ho… -
How baby plant food transforms into delicious coffee flavours
A mother coffee plant gifts its baby everything it needs to grow—a green seed packed with food. But when we roast coffee, we hijack that gift and turn it into something else: flavor. But what is flavor, at a microscopic level? What actually happens… -
Fruit juice or creamy almonds? Your guide to controlling cold brew flavors
When I started making cold brew this last year, I treated it like hot brew filter coffee. But no matter how I adjusted the grind or tweaked the brew time, I hardly got any differences in flavor… Then it hit me: cold brew isn’t just a slower hot bre… -
Cold Brew, Part 1: How temperature transforms coffee flavors
For years, I used cold brew as a last resort—the only brew method to tame dark, oily beans that were too bitter for hot water. Then one day, I took a chance on a Guatemalan Gesha and brewed it cold. The result? A massive explosion of florals I’d n… -
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… -
Freshness and Grinding, Part 2: How grinders work deep inside
Deep inside your coffee grinder, tiny changes can have massive consequences. This episode takes you deep inside Mahlkönig’s grinders to show you how coffee is ground and the importance of particle sizes on flavour. If you’re a home coffee lover… -
Freshness and Grinding, Part 1: Protecting your coffee's flavours
For your coffee to taste its best, it’s crucial you buy fresh roasts and grind fresh.… .….Or maybe not. When I began creating this episode, I was convinced that ‘fresh is best’. But, after delving into the science of coffee freshness, I don’t... -
What Is Good Science? Part 2: How to think like a scientist
In the last episode, I discovered that rinsing my Chemex filter papers was a waste of time! As a result I’ve managed to claw back over seven days of my life left on earth. But why stop there? The coffee industry is full of elaborate ways of... -
What Is Good Science? Part 1: How to brew coffee like a scientist
Should you rinse your filter paper before making a filter coffee? Almost everybody in coffee internet says you should. But what if most of coffee internet was wrong? In this episode, I show you how I try to answer this question like a professional… -
Organic Coffee, Part 2: Why don't we see more organic coffee farms?
Farming coffee organically is amazing because soils are more alive, birds and insects are more plentiful, farmers avoid getting sick with agrochemicals. But, if it’s so great, why is less than 10% of the world’s coffee grown organically? The fact.…