BOILING WATER for 15 to 20 minutes kills 99.9% of all living things and vaporizes most chemicals. Minerals, metals, solids and the contamination from the cooking container become more concentrated.
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How a coffee's chemistry changes as it cools down all depends on how you store the coffee and how long you wait for it to cool/leave the coffee before you microwave it, says Yates. That's why you love that initial smell when you first brew your cup of coffee, but it wears off as you drink it.