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Data source: Google Trends
Additional Info: Relative search volume is a unique Google thing; the shape of the chart is accurate but the actual numbers are meaningless.

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Popularity of the 'expanding brain' meme correlates with...

VariableCorrelationYearsHas img?
The number of log graders and scalers in Indianar=0.9913yrsNo
Votes for Democratic Senators in Mississippir=0.996yrsYes!
The number of private detectives in Rhode Islandr=0.9613yrsNo
The number of orderlies in Hawaiir=0.9511yrsYes!
The number of farm equipment mechanics in West Virginiar=0.9412yrsYes!
Annual book sales in the USr=0.937yrsNo
The number of special education teachers in Washingtonr=0.9211yrsNo
Votes for Democratic Senators in Minnesotar=0.916yrsNo
Liquefied petroleum gas used in Kyrgyzstanr=0.9116yrsYes!
Master's degrees awarded in Engineering technologiesr=0.8510yrsNo
Jet fuel used in Kazakhstanr=0.8416yrsYes!
The number of private detectives in Nevadar=0.8217yrsNo
Total comments on 3Blue1Brown YouTube videosr=0.749yrsNo
Google searches for 'flights to Antarctica'r=0.7218yrsNo
The number of dental hygienists in Vermontr=0.517yrsNo
The distance between Mercury and the moonr=-0.4918yrsNo

Popularity of the 'expanding brain' meme also correlates with...

VariableCorrelationYearsSys. Score
The number of environmental science teachers in Georgiar=0.9713yrs384
Votes for Republican Senators in Minnesotar=0.976yrs314
The number of travel agents in South Carolinar=0.9317yrs312
Intercountry adoptionsr=0.928yrs294
Votes for Republican Senators in Minnesotar=0.936yrs278
Popularity of the first name Katlinr=0.8810yrs276
The number of environmental science teachers in Californiar=0.8916yrs256
The number of transportation inspectors in Mainer=0.8916yrs246
Votes for Democratic Senators in Minnesotar=0.916yrs245
The number of hotel managers in North Dakotar=0.8917yrs236
The number of food and tobacco roasting, baking, and drying machine operators and tenders in Wisconsinr=0.8917yrs226
The number of food scientists and technologists in Marylandr=0.8917yrs216
The number of crane operators in Idahor=0.8817yrs205
The number of chefs and head cooks in Guamr=0.8817yrs195
The number of social work teachers in Nebraskar=0.8915yrs174
Automotive recalls issued by Keystone RV Companyr=0.7717yrs168
Petroluem consumption in Albaniar=0.816yrs166
Number of public school students in 6th grader=0.7617yrs165
The number of atmospheric and space scientists in Missourir=0.8716yrs162
Popularity of the first name Babyr=0.7617yrs160
Google searches for 'unicorns'r=0.7218yrs158
Popularity of the first name Conorr=0.7417yrs158
Total length of MrBeast's YouTube videosr=0.812yrs154
Robberies in Alaskar=0.7717yrs151
Air pollution in Port Angeles, Washingtonr=0.817yrs151
Number of websites on the internetr=0.7813yrs150
Total views on Simone Giertz's YouTube videosr=0.7910yrs150
Air pollution in San Juan, Puerto Ricor=0.7818yrs149
Hot days in Parisr=0.8110yrs149
Total comments on Simone Giertz's YouTube videosr=0.7610yrs146
Number of public school students in 5th grader=0.7217yrs144
Air pollution in Napa, Californiar=0.7715yrs144
Number of Grand Slam Finals played by Roger Federerr=0.7610yrs142
Global revenue of Samsoniter=0.7316yrs142
US Sales of Artificial Christmas Treesr=0.7513yrs142
Google searches for 'rick and morty'r=0.7611yrs142
Annual US household spending on laundry and cleaning suppliesr=0.7117yrs140
xkcd comics published about technologyr=0.6816yrs140
Altria Group's stock price (MO)r=0.718yrs139
The number of movies Jon Hamm appeared inr=0.6518yrs139
Number of times 11 was a winning Mega Millions numberr=0.6718yrs138
Drenching rain in Perthr=0.6917yrs138
Cheddar cheese consumptionr=0.6516yrs137
Jet fuel used in Guatemalar=0.816yrs136
Global iPod Salesr=0.739yrs136
The number of computer user support specialists in Montanar=0.9111yrs134
Associates degrees awarded in Natural resources and conservationr=0.711yrs134
Associates degrees awarded in Precision productionr=0.711yrs134
UK Public Library Countr=0.749yrs133
Annual US household spending on educationr=0.6815yrs133
Drenching rain in Parisr=0.6715yrs133
Popularity of the first name Joeller=0.7417yrs128
Jet fuel used in Icelandr=0.7817yrs124
Total comments on The Game Theorists YouTube videosr=0.7315yrs116
Jet fuel used in Paraguayr=0.7916yrs114
The number of paralegals in Missourir=0.8715yrs113
Air pollution in Sheridan, Wyomingr=0.7318yrs112
Master's degrees awarded in Engineeringr=0.710yrs104
Google searches for 'same day shipping'r=0.6518yrs103
The number of veterinary assistants in Minnesotar=0.8617yrs102
Jet fuel used in Eswatinir=0.7816yrs102
Average length of MrBeast's YouTube videosr=0.7212yrs102
Popularity of the first name Samarar=0.7217yrs100
The number of proofreaders in Nevadar=0.8814yrs92
Petroluem consumption in New Zealandr=0.7717yrs92
Popularity of the first name Harleyr=0.717yrs86
Average views of 'Be Smart' science YouTube videosr=0.7311yrs82
Jet fuel used in Chadr=0.7716yrs81
Popularity of the first name Joyr=0.717yrs76
Jet fuel used in Serbiar=0.7716yrs71
Total views on Extra History YouTube videosr=0.6912yrs68
Popularity of the first name Raheemr=0.6817yrs64
Hydopower energy generated in Turkmenistanr=0.7416yrs60
Average number of comments on 'Be Smart' science YouTube videosr=0.711yrs58
Kerosene used in Zimbabwer=0.7516yrs48
Total comments on 'Be Smart' science YouTube videosr=0.711yrs48
How 'hip and with it' SciShow Space YouTube video titles arer=0.710yrs37
Kerosene used in Chadr=0.7416yrs36
Petroluem consumption in Costa Ricar=0.7416yrs26
How fun MinuteEarth YouTube video titles arer=0.6911yrs26
How professional-sounding SciShow Space YouTube video titles arer=0.6910yrs16
Total length of Computerphile YouTube videosr=0.6911yrs6
Hydopower energy generated in Colombiar=0.7416yrs4
Renewable energy production in Colombiar=0.7216yrs-8
Petroluem consumption in Mauritiusr=0.7416yrs-18
Kerosene used in Comorosr=0.7316yrs-30
Liquefied petroleum gas used in Germanyr=0.7217yrs-40
Jet fuel used in Indiar=0.7316yrs-50


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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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