Plato reportedly wanted every book he wrote burned. Democritus of Abdera, born around 460 BC, deduced that reality is made of uncuttable particles moving through an infinite void 24 centuries before modern physics. This episode traces how a young man wealthy enough that his father hosted Xerxes’ invading army, and reportedly tutored by Persian Magi, liquidated his inheritance to study mathematics in Egypt and astronomy in Babylon, returning home penniless but honored with bronze statues.

We explain the Eleatic paradox of Parmenides and Zeno that denied motion, and how Democritus and his mentor Leucippus answered it with atoms and the void, hooked and jagged shapes snapping together like building blocks. We then explore his claim that taste and color exist only by convention, his infinite multiverse of growing and colliding worlds, his mechanical account of human civilization, and the ethics of euthymia that earned him the nickname the laughing philosopher.

• Why traveling across empires dissolved his faith in any single local mythology
• “In reality we know nothing, for truth is in the depths”
• Doing wrong as illogical because it corrupts your own peace of mind
• The stepped surface of a cone and a foreshadowing of calculus
• Nearly 80 lost treatises preserved only through critics like Aristotle, and the echo of the Pauli exclusion principle