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Data source: US Postal Service
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Cost to send a letter via the USPS correlates with...

VariableCorrelationYearsHas img?
Google searches for 'i am dizzy'r=0.9817yrsYes!
Church & Dwight Co.'s stock price (CHD)r=0.9817yrsNo
Microsoft's Worldwide Earningsr=0.9717yrsNo
Associates degrees awarded in gender studiesr=0.9711yrsYes!
Wind power generated in Francer=0.9716yrsNo
Popularity of the first name Bonnier=0.9617yrsNo
Hispanic cheese consumptionr=0.9616yrsNo
The number of nurse practitioners in Idahor=0.9611yrsNo
Popularity of the first name Theodorer=0.9617yrsNo
Google searches for 'do i need to go to the doctor'r=0.9617yrsNo
Butter consumptionr=0.9616yrsNo
The number of human resources specialists in Oregonr=0.9511yrsNo
Google searches for 'my cat scratched me'r=0.9515yrsNo
Google searches for 'what is my zodiac sign'r=0.9517yrsYes!
Associates degrees awarded in linguisticsr=0.9511yrsYes!
NIKE, Inc.'s stock price (NKE)r=0.9417yrsNo
Hydopower energy generated in Burundir=0.9416yrsYes!
Annual US household spending on porkr=0.9217yrsNo
The number of statisticians in Vermontr=0.8817yrsNo
The number of opticians in Puerto Ricor=0.8617yrsYes!
US Rice Consumptionr=0.814yrsYes!
The number of private detectives in Ohior=0.7317yrsNo



Cost to send a letter via the USPS also correlates with...

VariableCorrelationYearsSys. Score
Ticket prices at North American movie theatersr=0.9717yrs412
Walmart's stock price (WMT)r=0.9517yrs412
McDonald's stock price (MCD)r=0.9617yrs412
Annual Revenue of Walt Disney Companyr=0.9617yrs410
Google searches for 'cold shower'r=0.9717yrs410
Google searches for 'how to go to space'r=0.9717yrs410
The Coca-Cola Company's stock price (KO)r=0.9517yrs410
Annual US household spending on fresh vegetablesr=0.9817yrs410
Average length of SmarterEveryDay YouTube videosr=0.9516yrs410
Average number of comments on Steve Mould's YouTube videosr=0.9614yrs410
Total wind power generated globallyr=0.9716yrs409
Electricity generation in Angolar=0.9716yrs409
Electricity generation in Bahrainr=0.9716yrs409
Google's Advertising Revenuer=0.9717yrs408
Google's annual advertising revenuer=0.9717yrs408
Inflation in the USr=0.9717yrs408
US Wind Power Generation Capacityr=0.9717yrs408
The distance between Neptune and Uranusr=0.9617yrs408
Popularity of the first name Milesr=0.9817yrs408
Popularity of the first name Mylesr=0.9817yrs408
Popularity of the first name Elianar=0.9817yrs408
Annual US household spending on fruits and vegetablesr=0.9717yrs408
Annual US household spending on fresh fruitsr=0.9717yrs408
Annual US household spending on utilitiesr=0.9717yrs408
Google's Annual Global Revenuer=0.9617yrs407
Global annual electricity generationr=0.9617yrs407
Annual Revenue of the Lego Groupr=0.9617yrs407
Annual US household spending on property taxesr=0.9617yrs407
Economic output of Washington metro arear=0.9616yrs406
Annual US household spending on meats, poultry, fish, and eggsr=0.9517yrs406
Annual US household spending on rented dwellingsr=0.9517yrs406
Annual US household spending on healthcarer=0.9517yrs406
US GDP per capitar=0.9614yrs404
US milk fat used to produce cheese (excluding cottage cheese)r=0.9516yrs404
Associates degrees awarded in Biological sciencesr=0.9711yrs404
The number of occupational therapists in Colorador=0.9817yrs390
Fossil fuel use in Bahrainr=0.9716yrs379
Google searches for 'tetanus'r=0.9617yrs378
Popularity of the first name Arir=0.9817yrs378
US dairy skim solids used to produce sour creamr=0.9516yrs373
Solar power generated in Bangladeshr=0.9716yrs369
Google searches for 'best colleges'r=0.9617yrs368
Union Pacific's stock price (UNP)r=0.9717yrs368
Popularity of the first name Eliasr=0.9717yrs367
Wind power generated in Belgiumr=0.9716yrs359
The TJX Companies' stock price (TJX)r=0.9717yrs358
Popularity of the first name Malcolmr=0.9717yrs357
Paypal's Number of Active Registered User Accountsr=0.9713yrs354
Renewable energy production in Chinar=0.9716yrs349
Google searches for 'i have a headache'r=0.9617yrs348
Ecolab's stock price (ECL)r=0.9717yrs348
Popularity of the first name Ivyr=0.9717yrs347
Yum! Brands' stock price (YUM)r=0.9717yrs338
Popularity of the first name Leonr=0.9717yrs337
Electricity generation in Hondurasr=0.9716yrs329
Salesforce's stock price (CRM)r=0.9617yrs327
Popularity of the first name Luciar=0.9717yrs327
Google searches for 'reddit'r=0.9515yrs325
Fossil fuel use in Saint Pierre and Miquelonr=0.9716yrs319
American Tower's stock price (AMT)r=0.9617yrs317
Popularity of the first name Kair=0.9717yrs317
Google searches for 'whatsapp'r=0.9613yrs314
Electricity generation in Senegalr=0.9716yrs309
Canadian National Railway Company's stock price (CNI)r=0.9617yrs307
Popularity of the first name Roryr=0.9717yrs307
Wind power generated in United Statesr=0.9716yrs299
CSX Corporation's stock price (CSX)r=0.9617yrs297
Popularity of the first name Brooksr=0.9717yrs297
Total renewable energy production globallyr=0.9616yrs288
Roper Technologies' stock price (ROP)r=0.9617yrs287
Popularity of the first name Catalinar=0.9717yrs287
Total geothermal power generated globallyr=0.9616yrs278
W.W. Grainger's stock price (GWW)r=0.9617yrs277
Popularity of the first name Nicor=0.9717yrs277
Solar power generated in Austriar=0.9616yrs268
WEC Energy Group's stock price (WEC)r=0.9617yrs267
Popularity of the first name Adar=0.9717yrs267
Renewable energy production in Belgiumr=0.9616yrs258
CGI Inc.'s stock price (GIB)r=0.9617yrs257
Popularity of the first name Waylonr=0.9717yrs257
Wind power generated in Chinar=0.9616yrs248
Illumina's stock price (ILMN)r=0.9617yrs247
Popularity of the first name Wesleyr=0.9617yrs246
Wind power generated in Japanr=0.9616yrs238
Eversource Energy's stock price (ES)r=0.9617yrs237
Popularity of the first name Arthurr=0.9617yrs236
Electricity generation in Saint Pierre and Miquelonr=0.9616yrs228
McCormick & Company's stock price (MKC)r=0.9617yrs227
Visa Inc.'s stock price (V)r=0.9714yrs216
Popularity of the first name Ruthr=0.9617yrs216
Renewable energy production in Australiar=0.9516yrs216


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You caught me! While it would be intuitive to sort only by "correlation," I have a big, weird database. If I sort only by correlation, often all the top results are from some one or two very large datasets (like the weather or labor statistics), and it overwhelms the page.

I can't show you *all* the correlations, because my database would get too large and this page would take a very long time to load. Instead I opt to show you a subset, and I sort them by a magic system score. It starts with the correlation, but penalizes variables that repeat from the same dataset. (It also gives a bonus to variables I happen to find interesting.)
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