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Every coffee question we have answered, from brewing and beans to grinders, gear and coffee drinks, newest first.

How to Know if Your Coffee is Under or Over-Extracted?

Sour, salty or soapy coffee is under-extracted; burnt, bitter or metallic coffee is over-extracted. How to tell and how to fix each one.

Coffee bubbles when poured because of carbon dioxide trapped in the beans during roasting. What the bubbles say about freshness.

Light roasts taste bright and acidic, medium roasts smooth and balanced, dark roasts bold and smoky. How roast level changes your cup.

Yes, coffee grounds are great for compost. They add nitrogen and break down fast. Here's how much to add and what to avoid.

The best way to add cinnamon to coffee is to sprinkle it on top of the grounds before brewing, not mixed in, so it won't clog your machine.

A shot of coffee is a small, strong dose of espresso. You need an espresso machine: grind, pack, tamp and brew. Here's how.

No coffeemaker? Six simple ways to brew a good cup anyway: cowboy coffee, coffee bags, cold brew, a faux French press, Turkish and stovetop.

Instant coffee lasts six months to two years, sometimes far longer. How to store it so it doesn't go stale, clump or grow mold.

Metallic-tasting coffee usually comes from your water, your machine or poorly roasted beans. How to find the cause and fix it.

Gibraltar vs. cortado: both mix espresso and steamed milk, but a Gibraltar is served in its own small glass. How the two drinks differ.

Ten common Keurig mistakes that hurt your coffee, from skipping descaling and using tap water to cheap pods and cold mugs.

Soapy coffee usually means a poorly rinsed brewer or mug, under-extraction, bad water or stale beans. How to fix it.