You are the lucky owner of a magnificent piece of biological machinery - the human brain. Your brain is always on, performs lightning-fast calculations, and is a whiz at making connections between seemingly unrelated factors and observations. The only downside is that your brain didn't come with an owner's

Physicians and scientists have often called the human body a beautiful instrument. The sense in which this metaphor is applied is primarily mechanistic. The human body is a beautiful instrument in that its parts mesh properly and each component performs its function superbly. The metaphor "beautiful