Olinto De Pretto (26 April 1857 – 16 March 1921) was an Italian industrialist and geologist from Schio, Vicenza. There is claimed by an Italian mathematician, Umberto Bartocci, that De Pretto may have been the first person to derive the energy–mass-equivalence , generally attributed to Albert Einstein. But this is refuted by Ignazio Marchioro in Quaderni di Schio, where it shows that the similarity was a coincidence, and that the energy proposed by De Pretto doubles the one of Einstein's formula. Also, De Pretto suggested that radioactive decay of uranium and thorium was an example of mass transforming into energy. Early life Olinto De Pretto was born on April 26, 1857, in Schio in what is now the province of Vicenza in northern Italy. Olinto was the sixth of seven children (three boys, four girls). His mother was Angelica Boschetti (1822–1905). His father, Pietro De Pretto (1810–1891), was an architect whose hobbies included astronomy and geology, two studies Olinto would later take up. He attended the Superior School of Agriculture in Milan where he studied agriculture and geology with a major in agronomics. He graduated in 1879 with a degree in agronomics. Immediately upon graduation he became a university assistant to professor Gaetano Cantoni, a Dean of the agricultural school. Together they developed methods that helped modernize Italian agriculture by improving methods of crop rotation and analyzing soil chemistry. When Cantoni died in 1887, Olinto left the university and became a director at a mechanical foundry mill owned by his older brother Silvio, where he worked for the rest of his life. Early scientific research and papers In 1888, as a result of his research with his brother Augusto, he published his first paper, "The Influence of the Raising and the Degradation of Mountains on the Development of Glaciers". In 1892, along with his brothers Augusto and Silvio they founded the Alpinistic Circle with Silvio as the first president. In 1896 the Bulletin of the Italian Society of Geology republished his article as "The Degradation of Mountains and Its Influence on Glaciers". In 1898, his paper titled "Glacial Epoch and Orografical Theory" was published in the Bulletin of the Italian Alpine Club. In 1899, he published "Geological Signs in the Surroundings of Schio". Contributions to physics and energy–mass-equivalence From 1899 to 1903 De Pretto began to study the emerging field of nuclear physics and its relationship to astronomy. He focused