the.com/courtesy

the social grease that costs nothing yet buys nearly everything.

means Polite, considerate behavior toward others — the small acts of good manners and respect that smooth human interaction.

from From Old French 'corteisie,' meaning the manners befitting a royal court — and that's the whole point. The word grew from 'curt' (court), the place where you learned how to bow, defer, and speak softly to your betters. Courtly behavior trickled down into ordinary life, and the polish of palace etiquette became the everyday kindness we now call courtesy. Its cousin 'courteous' came along the same path, and far back the trail leads to Latin 'cohors' — an enclosed yard or gathering — which also gave us 'court' itself.

royal roots
Named for behavior expected at medieval court.
the wave
Letting cars merge releases the same hormone as winning.
costs zero
Politeness is the only free luxury good.
contagious math
One kind act triggers chains down three people.
for instance

japanese bowing ritual — depth and duration of bow conveys respect level in business and social situations across japan

british tea service tradition — afternoon tea with proper etiquette and timing established in victorian england as social courtesy

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