Why? Quotes

“Simply put, Leonardo replaced the mystic black bile, faculties, and spirits that permeated the writings of Galen, Avicenna, de Luzzi, and others, with his physical powers of movement, weight, force, and percussion - the building blocks of mechanics. he further used these mechanical concepts to demystify a whole host of physiological processes.”
― Mario Livio, Why?: What Makes Us Curious