Over 2,000 years ago there was a philosopher who believed in atoms, speculated about aliens, created a theory of evolution — and even said religion was just superstition.
Here's a brief introduction to Epicureanism, the strangest (and most controversial) ancient philosophy...
Epicurus was a philosopher who lived in Athens in the 3rd century BC.
He refined and expanded on existing beliefs until he had created a definitive philosophy of his own: Epicureanism.
Epicurus also set up a school in Athens, where he taught these ideas, known as "the Garden".
In the 1st century BC these beliefs were put into an epic poem by a Roman poet called Lucretius.
This poem, called "On the Nature of Things", is sort of like the Epicurean manifesto.
All quotes here are from On the Nature of Things, as translated by AE Stallings in 2007.