Picture yourself at a busy pedestrian crossing. When the light is red, everyone waits -- until one person starts to cross. Soon, others follow, and eventually everyone follows the crowd and crosses.

At a busy street crossing, people wait for the signal to change. When one person steps out first, others soon follow.

A spinning tool plunges into two pieces of metal, rotating at a high rate of speed. As the tool begins to move, it softens ...

The Swiss cheese known as Tête de Moine or “monk’s head” is served in a peculiar fashion. A specially designed blade scrapes off thin slices of the cheese wheel, rotating around its surface like a ...