Humanity stands...before a great problem of finding new raw materials and new sources of energy that shall never become exhausted. In the meantime we must not waste what we have, but must leave as much as possible for coming generations.


Chemistry in Modern Life (1925), trans. Clifford Shattuck-Leonard, vii


Humanity stands...before a great problem of finding new raw materials and new sources of energy that shall never become exhausted. In the meantime we ...

Humanity stands...before a great problem of finding new raw materials and new sources of energy that shall never become exhausted. In the meantime we ...

Humanity stands...before a great problem of finding new raw materials and new sources of energy that shall never become exhausted. In the meantime we ...

Humanity stands...before a great problem of finding new raw materials and new sources of energy that shall never become exhausted. In the meantime we ...