Rillieux chained vacuum chambers to reuse steam in sugar refining
Norbert Rillieux's multiple-effect evaporator chained vacuum chambers so each stage's vapor boiled the next, cutting fuel and eliminating manual ladling.
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3,236 PUBLISHED CASES · REGULARLY UPDATEDRobeson and Birchfield delayed money pack trigger until robber left
Two Atlanta inventors delayed money pack activation until the robber left the building.
Read the caseNavy codebreakers faked a water shortage to confirm Midway
US Navy codebreakers faked a Midway water shortage to confirm the target 'AF' before committing the Pacific fleet.
Read the caseRoom 40 revealed Zimmermann Telegram via Mexico copy
Britain revealed the Zimmermann Telegram to America using a duplicate obtained from Mexico's commercial cable, hiding that they had broken German codes.
Read the caseRoss Gear advertised trucks, not gears, to reach all buyers
Ross Gear advertised trucks generally, not its steering gears, to reach manufacturers, dealers, and buyers at once, boosting adoption.
Read the caseRossel Island shell money built interest into ranked units
Rossel Island's shell money ranked units so debts repaid one rank higher per time, embedding compound interest without arithmetic.
Read the caseRounders' bouncers caught fake IDs by quizzing holders on hometown trivia
Rounders' bouncers stopped inspecting fake IDs and started asking holders hometown trivia, catching fakes and borrowed IDs.
Read the caseHill fixed Britain's mail by charging the sender
Rowland Hill fixed Britain's mail by charging the sender a flat penny upfront, using the first adhesive stamp, so refusal couldn't dodge payment.
Read the caseSan Francisco revived purok clubs to cut disaster warning last mile
San Francisco revived dormant purok units for house-to-house warnings, achieving zero casualties in Typhoon Haiyan.
Read the caseSanku fortified village flour by hiding the cost in bag sales
Sanku bolted an IoT dosifier onto small Tanzanian mills and paid for premix from the margin on flour bags, so fortifying cost millers nothing.
Read the caseCongress multiplied capital for small firms via private investors
Congress passed the 1958 SBIC Act, lending to private firms instead of picking startups, multiplying capital for small businesses.
Read the caseScipio Africanus stopped Hannibal's elephants by opening lanes, not building walls
Scipio Africanus, facing Hannibal's elephants at Zama, opened lanes in his formation so they ran through harmlessly, not building a stronger wall.
Read the caseGuardian gave itself an owner who couldn't die
Death duties threatened the Guardian, so John Scott put it in a trust that can't die.
Read the caseSears sold houses like catalog goods, shipping pre-cut kits
Sears sold houses like catalog goods: pre-cut, labeled kits shipped by rail, so buyers assembled them without pros.
Read the caseSEC let insiders trade by locking in plans before they knew
The SEC let insiders trade by making them commit to a written plan before they knew anything material.
Read the caseSellers standardized screw threads by getting big buyers to demand them
William Sellers got the Army, Navy, and railroads to specify his screw thread, forcing suppliers to adopt it.
Read the caseSeva Mandir cut teacher absence with student-taken timestamped photos
Seva Mandir cut teacher absence by paying per verified day, using student-taken timestamped photos.
Read the caseShah Abbas gave silk trade to relocated Armenians to avoid a rival
Shah Abbas I relocated Armenian merchants to New Julfa, giving them the silk trade because their outsider status prevented them from becoming a domestic rival.
Read the caseShannon Airport invented duty-free to survive jets
When jets threatened Shannon's refueling stop, Brendan O'Regan created duty-free shopping to give travelers a new reason to land.
Read the caseShuangtong Plastics fired Walmart and Dollar Tree to sell to small buyers
Shuangtong Plastics' Lou Zhongping fired Walmart and Dollar Tree and sold to thousands of small buyers via Alibaba, lifting margins from near zero to 20%.
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