The "explanation" of radioactivity led to the discovery of isotopes by Rutherford and soddy in 1914, and with this discovery a revision of our idea of elements became necessary.
"A Brief History of Element Discovery, Synthesis, and Analysis"
Glen W. Watson
Everybody's known about the possibilities, for soddy wrote a book about it; but nobody's ever suggested where the key could be found to unlock that treasure-house of energy.
"The Man Who Rocked the Earth"
Arthur Train Robert Williams Wood
Here the stream ran once in a maze of soddy banks and watered all the ground, and afterward ran out at the canyon's mouth across the mesa in a wash of bone-white boulders as far as it could.
"Good Stories For Great Holidays Arranged for Story-Telling and Reading Aloud and for the Children's Own Reading"
Frances Jenkins Olcott