Nicola Tesla 1893. 
Vivekananda skrev i ett brev till en vän daterat den 13 februari, 1896: 
”Mr. Tesla was charmed to hear about the Vedantic prana and akasha and the kalpas. He thinks he can demonstrate mathematically that force and matter are reducible to potential energy. I am to go to see him next week to get this mathematical demonstration. In that case Vedantic cosmology will be placed on the surest of foundations. I clearly see their perfect union with modern science, and the elucidation of one will be followed by that of the other.”(Vivekananda. Complete Works, Vol. V, Fifth Edition, p. 77) Tesla lyckades inte att för Vivekananda matematiskt beskriva förhållandet mellan massan och energin. Men det hängde i luften och 1905, några år senare publicerades ekvationen E = mc2 av Albert Einstein. Först ut var dock italienaren Olinto de Pretto som publicerade sin version 1903.