There are few things more frustrating than coffee going cold. (Even if you have an insulated carafe and heat your frothed milk, the temperature will inevitably drop if you don’t gulp it down right ...

Add Yahoo as a preferred source to see more of our stories on Google. The self-heating Ember Mug is one of the greatest coffee inventions, well, ever. (Photo: Ember) If you like coffee, even a little, ...