The attraction is known as the Casimir Effect, named for its discoverer, who, 50 years ago, was trying to understand why fluids like mayonnaise move so slowly.

• 这种吸引力被称为卡西米尔效应，它的发现者在五十年前提出这种效应，目的在了解为什么像蛋黄酱一样的液体，流动的速度为何会如此的慢。