In 6th grade science class my teacher, Mr. Mason, demonstrated the space-filling property of liquids by slowly pouring a drum of water into an eight ounce tumbler. The water overflowed the cup, and he kept pouring. As the puddle spread across the floor, to our desks and around our feet, Mr. Mason imparted the insight: “See? This water wants to fill up this container, our room.”

Of course, Mr. Mason was, like we were, much more fascinated by the vandalistic act of dumping large quantities of water on a fine hardwood floor, but it did leave an impression.

But Mr. Mason was just warming up. The scientific revelations that came later in the year were far more mind-bendingly spectacular. In one memorable lecture, he explained to us the purpose of the mysteriously useless pound and asterisk buttons on touch-tone phones. In 1980 the only buttons that did anything were the numbers, and we always wondered what the other two were doing there. When Mr. Mason told us he knew what they were for, he had our attention. In the not-distant future, they would be used by the government to stun people. Agents would call criminals up, hit the pound key to freeze them in their seats, and capture them without having to shoot them.