What Einstein did for physics, a Spaniard named Santiago Ramón y Cajal did for neuroscience more than a century ago.
Back in the 1890s, Cajal produced a series of drawings of brain cells that would radically change scientists' understanding of the brain.
And Cajal's drawings aren't just important to science. They are considered so striking that the Weisman Art Museum in Minneapolis has organized a traveling exhibition of Cajal's work called The Beautiful Brain.