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Ancient Greece, Egypt, Persia, Mesopotamia, China, and India — the civilizations that built the foundations of the modern world.

Emperors, legions, republic, and empire — the full sweep of Roman civilization from Romulus to Romulus Augustulus.

Crusades, feudal lords, castles, plague, and the slow emergence from medieval Europe into the Renaissance.

Species from every corner of the animal kingdom — mammals, birds, reptiles, fish, insects, and the extraordinary diversity of life on Earth.

From Socrates and Plato to Kant and Nietzsche — the history of philosophical thought, one Wikipedia article at a time.