Enter Ember, and its "smart mug." Unlike your dumb mug, Ember's cup can keep your drink at a stable temperature of your choosing, ranging between 120˚F and 145˚F. You set the temperature in the ...

An curved arrow pointing right. Rejoice, coffee lovers. This high-tech Ember coffee mug claims it will keep your drink at the perfect temperature — down to the very last degree. Here's how it works.