 Following an unexceptional school career, Marx studied law and philosophy at the universities of Bonn and Berlin. His doctoral thesis was in ancient philosophy, comparing the philosophies of nature of Democritus (c.460–370 BCE) and Epicurus (341–270 BCE). From early 1842, he embarked on a career as a radical journalist, contributing to, and then editing, the Rheinische Zeitung, until the paper was closed by the Prussian authorities in April 1843.