Who Made That Coffee Lid? (Published 2013)

In the late 1970s, when you ordered coffee to go, you usually had to tear a hole in the plastic lid if you wanted to drink through it. This maneuver was so awkward that you risked burning your hand. So in the 1980s, a number of food-packaging engineers tried to fix the problem. William and Kenneth Dart, of the Dart Container Corporation, created one of the first of a new breed of coffee-cup lids,

[legoboku]

会社でもらったタンブラーに空気穴があり、それを開けないと飲めないのは、スタバのコーヒーカップと同じ原理だな。

[ROYGB]

そのままでも飲めるコーヒーカップのフタの話。