A discovery is said to be an accident meeting a prepared mind.

Through the ages, man's main concern was life after death. Today, for the first time, we find we must ask questions about whether there will be life before death.

The source of this energy is the sun's radiation.

This paper of yours is so lightly written that you must have sweated terribly.

A substance that makes you ill if you don't eat it.

[A vitamin is] a substance you get sick from if you don't eat it.

It is impossible to encircle the hips of a girl with my right arm and hold her smile in my left hand, then proceed to study the two items separately. Similarly, we can not separate life from living matter, in order to study only living matter and its reactions. Inevitably, studying living matter and its reactions, we study life itself