Every chemical substance, whether natural or artificial, falls into one of two major categories, according to the spatial characteristic of its form. The distinction is between those substances that have a plane of symmetry and those that do not. The former belong to the mineral, the latter to the living world.

If you suppress laboratories, physical science will be stricken with barrenness and death.

Virulence appears in a new light which cannot but be alarming to humanity; unless nature, in her evolution down the ages (an evolution which, as we now know, has been going on for millions, nay, hundreds of millions of years), has finally exhausted all the possibilities of producing virulent or contagious diseases - which does not seem very likely.

Will opens the door to success, both brilliant and happy.

Science belongs to no one country.

Let me tell you the secret that has led me to my goal. My strength lies solely in my tenacity.

Question your priorities often, make sure God always comes first.