Input (grade 6): One of its first proponents was Pyrrho of Elis (c. 360-275 B.C.), who traveled and studied as far as India and propounded the adoption of "practical" skepticism.
Output (grade 10): In the 4th century BC Pyrrho of Elis (c360 â "275 BC), who traveled and studied as far as India, adopted practical skepticism.