
Terracotta Army
Thousands of life-size clay soldiers in battle formation, no two faces alike, guarding an emperor's tomb since 210 BC.

Thousands of life-size clay soldiers in battle formation, no two faces alike, guarding an emperor's tomb since 210 BC.

Five assumptions about points and lines, and from them Euclid derives hundreds of theorems, up to the proof that the primes never run out. You finish knowing what a proof is.

Zhuang Zhou dreams he is a butterfly and wakes unsure which one is dreaming. The jokes, tall tales, and arguments with logicians that follow work to loosen your grip on your own categories.

Seeing a child about to fall into a well, anyone feels alarm before thinking. Human nature is therefore good, Mencius argues, and a ruler who starves his people forfeits the throne.

Pleasure is the absence of pain and fear, Epicurus taught, so want less and eat plainly. Death is nothing to us: where death is, we are not. Friendship he counted the greatest good.

Confucius answers his students in short exchanges: never do to others what you would not want done to yourself, and let ritual shape everything. Chinese officials memorized it to hold office until 1905.