Science is vastly more stimulating to the imagination than the classics.

This is my prediction for the future: Whatever hasn't happened will happen, and no one will be safe from it.

I do not believe in the commercial possibility of induced radioactivity.

There are 400,000 species of beetles on this planet, but only 8,000 species of mammals.

The wise man regulates his conduct by the theories both of religion and science. But he regards these theories not as statements of ultimate fact but as art-forms.

In fact, words are well adapted for description and the arousing of emotion, but for many kinds of precise thought other symbols are much better.

I have tried to show why I believe that the biologist is the most romantic figure on earth at the present day. At first sight he seems to be just a poor little scrubby underpaid man, groping blindly amid the mazes of the ultra-microscopic, engaging in bitter and lifelong quarrels over the nephridia of flatworms, waking perhaps one morning to find that someone whose name he has never heard has demolished by a few crucial experiments the work which he had hoped would render him immortal.