What we are today represents an adjustment achieved over the millions and hundreds of millions of years. - Rachel Carson

In the fish world many things are told by sound waves.

It is a curious situation that the sea, from which life first arose, should now be threatened by the activities of one form of that life. But the sea, though changed in a sinister way, will continue to exist; the threat is rather to life itself.

The figure is staggering and its implications are not easily grasped-500 new chemicals to which the bodies of men and animals are required somehow to adapt each year, chemicals totally outside the limits of biologic experience.