USP counts Brazil's protest crowds with drone AI — and cut inflated estimates to size
A political scientist repurposed a cattle-counting AI: drone imagery becomes a headcount that cut Bolsonaro's claimed 600,000 rally to an estimated 185,000.
阅读案例genius.wikiCASESTUDIES.CHAT 旗下档案
好问题，
有巧解。
探索打破常规的解法，理解它们为什么有效。
完整档案，尽在 App文章提供简体中文与英文版本。以下标题与正文保留原出版语言。
已发布案例
500 已发布案例 · 定期更新USDA drops Tylenol-laced dead mice by cardboard parachute to poison Guam's tree snakes
With Guam overrun by brown tree snakes and its forest birds gone, USDA parachutes dead mice laced with acetaminophen into the treetops.
阅读案例United's vaccine sweepstakes drew 400k entrants and 100k MileagePlus sign-ups in 48 hours
United skipped the small certain reward (miles for all) and ran a first-class-trip lottery for vaccinated flyers — behavioral science did the marketing.
阅读案例Uber and Lyft made surge invisible: one opaque fare, rider and driver rates decoupled
Ride-hailing replaced visible surge with upfront fares tuned to each rider's willingness to pay, paying drivers separately and pocketing the spread.
阅读案例Zach Gage's Typeshift rebuilt the crossword so nobody runs out of game
Sliding letter columns make words from a fixed pool — players can recall, intuit or brute-force answers, so being stuck is never the end.
阅读案例Tokyo Metro paid early commuters in soba to uncrowd its 199%-capacity Tozai Line
Ten early mornings earned a bowl of noodles: Tokyo Metro gamified off-peak riding with streaks and collective unlock rewards.
阅读案例Susa gave its own portfolio founders no-fee, no-carry LP slots in a parallel $2M fund
Inside its $90M third fund, Susa carved out a parallel vehicle for its current founders to invest alongside the firm — 40+ signed up, at zero economics.
阅读案例Surgical Safety's OR black box records everything; checklists skipped in 1 of 5 operations
Teodor Grantcharov's operating-room black box records video, audio and anesthesia data, then AI counts the errors surgeons' memories leave out.
阅读案例Therapy plus $200 in cash cut Liberia's highest-risk men's crime for 10 years
Eight weeks of CBT plus $200 cut crime and violence about 50% among 999 of Monrovia's most dangerous men — and the effect held a decade later.
阅读案例Mitchell Energy fracced shale with plain water — twice the gas at half the cost
Fearing for his job on a failing gas field, engineer Nick Steinsberger swapped fracking gel for water, bleach and soap — inventing slickwater fracturing.
阅读案例Sound designers rebuilt the microwave beep on its own cheap buzzer — code only
Starling's two-person team made piezo buzzers play trills and fake dynamics via resonance sweeps — no new hardware, just different code.
阅读案例Stephon Marbury's $15 Starbury sold 4M pairs by proving cheap wasn't junk (interview)
A two-time NBA All-Star put his name on a $15 sneaker and beat the price-equals-quality signal with chainsaw cut-tests and a season played in them.
阅读案例Signal hid its traffic inside Google's, so blocking the app meant blocking Google
After Egypt and the UAE blocked Signal in 2016, Open Whisper Systems shipped domain fronting: censors see a connection to Google, and stay blind to Signal.
阅读案例ShopYoBrand ran Iraq's credit cards for them — link, buy abroad, pay cash (interview)
No Iraqi cards, no Amazon access: Randi Rahbar bought on her own European cards via UK/US addresses and took cash at the door — 20% on a $100 order.
阅读案例Somali cargo networks turned Kenya's white-elephant airport into a cheap import funnel
Pooled diaspora demand, Dubai consolidation and landings at underused Eldoret let Somali-run cargo firms undercut Nairobi's official distributors.
阅读案例Roosevelt Island sucks its trash through tubes so trucks never come
Since 1975 Roosevelt Island has flushed its trash at 65 mph through underground tubes to a central compactor, keeping garbage trucks off its narrow streets.
阅读案例Ron Rivest locked MIT's time capsule with a puzzle that takes decades of sequential math
Rivest built a lock solvable only through ~80 trillion sequential squarings — parallel hardware buys nothing, so elapsed time itself becomes the key.
阅读案例A hobbyist tracked SF parking enforcement live by predicting ticket numbers
Riley Walz found citation numbers follow a fixed pattern, scraped them in real time and mapped every ticketing officer — until the city pulled the feed.
阅读案例Rio commuters ran WhatsApp bus groups that beat Google Maps with real-time peer reports
Route-specific WhatsApp groups turn Rio bus riders into live sensors, out-reporting official apps in suburbs where timetables are fiction.
阅读案例reCAPTCHA: von Ahn turned 200M daily CAPTCHAs into free NYT archive digitization
Luis von Ahn made the words OCR couldn't read double as the CAPTCHA itself, so 10 seconds of bot-proofing per user also transcribed the NYT's archive.
阅读案例