Coffee
How Caffeine Works: Adenosine Receptors, Tolerance, and What the Research Shows
How caffeine blocks adenosine receptors to reduce sleepiness, why tolerance develops, what the caffeine crash actually is, and what research shows about performance and safety.
BeginnerThe Science of Coffee Extraction: Grind, Temperature, and Yield
How coffee compounds extract in sequence, what extraction yield means, why grind size and water temperature matter, and how to fix under- or over-extracted coffee.
Intermediate