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You grab your morning coffee and wait for that familiar energy kick. Half an hour passes, and somehow you feel ready to go right back to sleep. About 30% of coffee drinkers actually experience drowsiness after their caffeine fix, and it means the world's favorite stimulant sometimes works backwards. Caffeine blocks the sleep messages in your body when it first hits your system. The problem is that those messages don't disappear - they pile up behind the scenes. Your genetics might mean that you process caffeine four times slower than the person sitting next to you, your blood sugar could...

Coffee recipes are very particular about water temperature, and they'll tell you the exact brewing ratio down to the gram. With grind size, though, the best that you usually get is something vague like "medium-coarse." That doesn't mean much for your grinder at home. The truth is that even a small adjustment of 50 to 100 microns can change your brew time and the way that your coffee tastes. Without any targets to work with, you're just guessing every time that you adjust your grinder. Professional baristas actually measure their grinds in microns, and they also track consistency percentages for...

Yesterday's leftover coffee goes into a mug and straight into the microwave. After 30 seconds, that first sip tells you the awful truth. What was great coffee yesterday has turned into something burnt, metallic and bitter in all the wrong ways. Fresh coffee has hundreds of volatile compounds in it that all need to work together. You have aromatic oils, acids that are nicely balanced and natural sugars that combine to create the flavors you actually like. The brewing process pulls these compounds out at just the right temperatures. The problem is that this creates a blend that starts to...

Those Kona coffee prices are enough to make anyone do a double-take. Most of us have been in that coffee aisle at some point, holding a bag that's marked $45 per pound or maybe watching a barista ring up a single Kona pour-over for $12. The mental math can be brutal when it dawns on you that a daily coffee habit at those prices could practically fund a car payment. Kona coffee costs an absolute fortune, and anyone who sees the price tag wants to know if they're actually buying something that's worth it or if they're just paying extra...