Sep 16, 2026 · 58 min
Victorian codebooks turned telegrams into one-word messages
How Codes Were Used To Hack The Telegram Business
The episode shows how the economics of telegraphy shaped compressed language, then applies physics and psychology to everyday questions about modern communication and survival.
- 1Telegraph codebooks compressed elaborate messages into single words, cutting costs while preserving surprisingly specific meanings.
- 2Modern texting abbreviations inherit a basic telegraph-era tradeoff: communicate more information with fewer characters and less effort.
- 3Surviving a fall depends less on softness alone than on absorbing energy and increasing the distance over which stopping occurs.
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Michael examines a telegraphic phrasebook that converts highly specific, sometimes grim family news into single words.
The brief
Hannah Fry and Michael Stevens open with an antique telegraphic phrasebook, revealing how a system that charged by the word encouraged elaborate messages to collapse into single code words.
The codebook’s bargain was more than shorthand: it turned private announcements, including grim family news, into compact signals while operators and callers navigated the limits of early networks.
The hosts connect telegrams to texting abbreviations and ask how communication technologies preserve obsolete forms, from skew morphs to icons inherited from older devices.
The episode then ranges across why phones rarely appear in dreams and why water spirals down drains, using emotional experience and fluid dynamics to unsettle familiar assumptions.
Its clearest physics lesson comes in the fall question: survival depends on absorbing energy and extending stopping distance, while body size helps explain why small animals tolerate falls better.
Featuring
The Universal Telegraphic Phrasebook
LOL
Thinking PhysicsBooks & mentions
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