Between the days of fecund productivity are inserted days of uncertainty when nothing seems to succeed, and when even matter itself seems hostile; and it is then that one must hold out against discouragement.
Public domain in the US
Public domain in the US. This English translation (Charlotte Kellogg, d. 1960) is protected in life+70 countries until the end of 2030.
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About the author
Marie Curie 1867–1934 · Polish-French physicist and chemist who pioneered research on radioactivity; the first person to win two Nobel Prizes. Wikipedia