In chemical terms, radium differs little from barium; the salts of these two elements are isomorphic, while those of radium are usually less soluble than the barium salts.
When radium was discovered, no one knew that it would prove useful in hospitals. The work was one of pure science. And this is a proof that scientific work must not be considered from the point of view of the direct usefulness of it.
You cannot hope to build a better world without improving the individuals. To that end, each of us must work for his own improvement and, at the same time, share a general responsibility for all humanity, our particular duty being to aid those to whom we think we can be most useful.
Nothing in life is to be feared. It is only to be understood.
I was taught that the way of progress was neither swift nor easy.
I have frequently been questioned, especially by women, of how I could reconcile family life with a scientific career. Well, it has not been easy.
