Einstein's Revolution: Library Edition (Audio Classics: Science & Discovery)

Relativity is a concept rooted in the tension between appearance and reality, and it reaches far back in history. Heraclitus argued that only change is real; Parmenides argued that change is impossible, and his follower Zeno invented paradoxes illustrating many of the problems in concepts like space, time, and infinity. Protagoras even argued that there is no single, correct view of reality, but that reality for any person is precisely as in seems to that person. In his words, Man is the measure of all things.