There are a few coffee chains that hand over coffee they want you to enjoy in twenty minutes. Drinking it immediately would result in burnt tongue syndrome. SmartLid could make your morning to-go cuppa a but more enjoyable. It goes on your coffee cup, just like any other plastic lid, but the difference is that as soon as it snaps on, it turns from dark brown to bright red. Once the liquid is cool enough to drink, it will turn back to its original color. If the concept catches on, coffee shops everywhere would surely get on board.