Possibilities are like the wings of birds; they allow man to soar and to climb to the heavens. And facts are like the atmosphere against which those wings must beat, and without which the soaring bird will surely plummet back to earth.

Perfect as the wing of a bird may be, it will never enable the bird to fly if unsupported by the air. Facts are the air of science. Without them a man of science can never rise.

Men are apt to be much more influenced by words than by the actual facts of the surrounding reality

Learn the ABC of science before you try to ascend to its summit.

Don't become a mere recorder of facts, but try to penetrate the mystery of their origin.

Edible substances evoke the secretion of thick, concentrated saliva. Why? The answer, obviously, is that this enables the mass of food to pass smoothly through the tube leading from the mouth into the stomach.

As we have seen, bread, and especially dry bread, evokes secretion of considerably larger quantities of saliva than meat.