Which missing detail changed your first impression?
Space & science
02 / THE GOLDEN AGE EXPLORER
Ideas crossed borders. Follow a few of them.
Books, observations and techniques crossed languages and cultures. Explore four places in that history of learning.
Tap a city. Modern locations are approximate; connecting lines illustrate exchange, not a single documented journey.
c. 820–830Baghdad
c. 1000Córdoba
Early 1000sCairo
1154Palermo
c. 820–830 / Baghdad
Equations with a practical purpose.
Al-Khwarizmi · Algebra
In ninth-century Baghdad, al-Khwarizmi set out systematic ways to solve equations, using words and geometry. The problems connected mathematics to inheritance, trade and land measurement.
He organised and extended earlier mathematical traditions. His book’s title helped give us the word algebra; his name later became the basis of algorithm.
An idea can travel much further than the person who wrote it.
Muslim scholars made major contributions within networks that also drew on Greek, Persian, Indian, Jewish and Christian learning. Continue in the Reading Room ↗
03 / QUIET GOOD
Good needs no audience.
One small kindness for the week. Choose it, do it, carry it forward.
✦
Week of 1 November
Check in, properly.
Send one thoughtful message to someone you haven’t checked on in a while.
Keep it simple: “You crossed my mind. How are you doing?” Give them time to answer, then listen.
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