Evil, by definition, is that which endangers the good, and the good is that which we perceive as a value.

It is a good morning exercise for a research scientist to discard a pet hypothesis every day before breakfast. It keeps him young.

Truth in science can be defined as the working hypothesis best suited to open the way to the next better one.

Few animals display their mood via facial expressions as distinctly as cats.

Man appears to be the missing link between anthropoid apes and human beings.

It ought to be realized by all dog owners that obesity shortens a dog's life quite considerably, a life which is much too short anyhow.

Most people have forgotten how to live with living creatures, with living systems and that, in turn, is the reason why man, whenever he comes into contact with nature, threatens to kill the natural system in which and from which he live.