The Greek letter phi (<p) is used to

The primary purpose of piston rings is to:

The Tao-te-aching (The Way and Its Power) is the basic text of Taoism, a Chinese religion and philosophy.
The Tao-te-ching is composed of 81 short chapters or poems that describe a way of life marked by quiet effortlessness and freedom from desire. Taoism teaches that this can be achieved by following the creative, spontaneous life force of the universe, called the Tao. The book is attributed to Lao-tzu, but it was probably written in the third century B.C.
The Tao-te-ching

In a hydraulic brake system, if brake action is soft, a likely explanation is:

Blood circulation from the lungs goes directly to the