even if the cup is clean and she's planning to drink coffee out of it. That got me thinking: Why do coffee and tea stain mugs so easily, and why are those stains so hard to remove? To find out ...

There's a running joke in my family that centers around my older sister's absolute refusal to use a cup or mug with ... Why do coffee and tea stain all my mugs, and why are the stains so hard ...

One tea-loving reader noticed how this beverage stains mugs, so wondered what impact it was having on her body. Other readers offer their insight, including how to make a better cup of tea The ...