How March Madness Selection Sunday works

How March Madness bracketology became a national obsession

An estimated 60 million people fill out March Madness brackets yearly, despite a one in 9.2 quintillion chance of filling it out perfectly. This Smithsonian magazine article explores how UCLA's dominance in the 1960s and '70s made brackets boring and predictable, and how the expansion to 64 teams and putting games on TV played a huge role in popularizing March Madness brackets.

The history of March Madness brackets

Every spring, millions of Americans fill out their March Madness brackets in hopes of picking the winner. But where did this annual tradition start? This CBS News article tells the story of how a bar in Staten Island started a $10 pool with 88 participants in 1977, and grew it into a $1.5 million contest that ended up getting shut down by the IRS.

What is the NCAA First Four?

March Madness's play-in games—known as the First Four—whittle down the field from 68 to 64. This resource from the NCAA breaks down the history of the First Four, which began in 2011. The gears were in motion long before that, though, thanks to the addition of the Mountain West Conference to Division I, which necessitated more than 64 teams for the March Madness field.

The surprisingly poetic origins of the phrase 'March Madness'

When legendary sportscaster Brent Musberger called the 1982 NCAA basketball tournament "March Madness," the term stuck and helped popularize the annual event. But he wasn't the first to use the phrase. This Time magazine article explores the contributions of Henry V. Porter, who originally used "March madness" in a 1939 article about the Illinois State basketball tournament, and later in a 1942 poem called "Basketball Ides of March."

A hoops expert on the likely March Madness expansion

Rumors about March Madness expanding to a field of 76 teams have led to consternation among some college basketball fans, who believe overcrowding the tournament will dilute what makes it great. HoopsHQ's Seth Davis argues it's a good idea, comparing the change to college football's recent (and highly successful) playoff system.

The history of the NIT, college basketball's other tournament

When people refer to March Madness, they're referring to the annual NCAA tournament, the most popular event in college basketball. Often overlooked is the National Invitational Tournament, or NIT, which is viewed as a consolation prize for teams that fail to earn bids to the NCAA. However, the NIT began as the premier tournament until it was eventually beaten out (and ultimately acquired) by its competitor.

The hidden effects of March Madness

March Madness isn’t just a major sporting event—it’s also peak season for vasectomies. Urologists report a 50% increase during the tournament, as patients use recovery time as an excuse to watch nonstop basketball. Meanwhile, workplace distractions from bracket pools and game streaming are estimated to cost US businesses $17 billion.

The odds of a perfect March Madness bracket are worse than finding one specific grain of sand on Earth

With 63 games to predict, random guessing produces odds of 1 in 9.2 quintillion. Even an informed picker who gets 67% of games right faces odds of about 1 in 120 billion, meaning if every American filled out a unique bracket, we'd expect a perfect one in roughly 366 years.

See what makes a team a Cinderella—the term for an underdog that goes on an unexpected March Madness run

Fox Sports Research analyzed past Cinderella runs and found that most share a dynamic duo of players, strong conference tournament momentum, and an offense and defense that both rank in the top 80 nationally.

Watch the greatest buzzer beaters, clutch shots, and crazy endings in March Madness history

From Christian Laettner's legendary 1992 buzzer-beater against Kentucky to Kris Jenkins' championship-winning 3-pointer in 2016, this compilation captures the most unforgettable last-second moments in tournament history.

Exploring the Larry Bird punch that almost changed March Madness

Learn how the NFL Draft works

Teams select players in a set order over seven rounds, with the weakest teams from the prior season picking first. Picks can be traded, and teams that lose free agents may receive additional compensatory picks.

See how a US Supreme Court justice is nominated and confirmed

A president nominates a Supreme Court justice, the Senate Judiciary Committee conducts public hearings and background vetting, and the full Senate debates and votes on confirmation—a process explained step by step in this video.

How the soccer World Cup works

The World Cup is the biggest game in the world. Watch this video to learn how it works and how it came to be such a massive world event.

Understanding the basics of football

While American football may be entertaining, for fans who never played the game it can be confusing. Why do teams choose to run, pass, line up in certain defenses, run people in motion, call audibles at the line—or do any of the many other things that happen on the field?

Sports betting, explained

Since a 2018 Supreme Court decision overturned the Bradley Act, which spurred a state-by-state legalization of online gambling, sports betting has become a rapidly growing multibillion-dollar industry.

An in-depth analysis of Augusta National, the home of the Masters

This in-depth analysis of Augusta National Golf Club, the famed site of the annual Masters Tournament, breaks down the course's complex greens and tricky layout. Golf Digest editor Luke Kerr-Dineen walks viewers through the course's green book, demonstrating just how difficult Augusta is compared to other courses. More than anything, it gives you some context to better understand why your favorite golfers might struggle with the course's punishing slopes.

The NBA consists of 30 teams and 450 players

The teams are divided into two conferences, the Eastern and Western, each playing 82 games from mid-October to mid-April. Conference champions meet in the NBA Finals each year in late May or June to crown a league champion.

How algorithmic redistricting works

Computational methods are convincing a number of judges that some state district maps are drawn illegally. Here's a simple overview of how it works.

The Super Bowl is the National Football League’s championship game

Played annually in early February between the league’s two conference champions, the game was created as part of the 1966 merger between the American Football League and the National Football League. It has become the most-watched sporting event in the US each year.

Listen to the methods and strategy of the secretive S&P 500 selection committee

Stocks are added to the S&P 500 by a secret selection committee that meets regularly to assess which companies can remain in the index, which companies need to be added, and which companies no longer meet the criteria. The members of the committee used to be public, but S&P Global decided to keep its members confidential after companies sent packages, letters, and gifts to try to make it into the index.

Learn how the Macy's Thanksgiving Day Parade comes together each year

The Macy’s Thanksgiving Day Parade is essentially a huge theatrical production spanning several long blocks in New York City rather than a stage. Naturally, organizing it is a complicated process. This podcast episode explains how the Macy’s Thanksgiving Day Parade comes together each year.

The history of Mother's Day in the US

Mother’s Day is a holiday honoring motherhood that is observed in different forms throughout the world. Learn about the origins of the official holiday in the US with this in-depth breakdown of the holiday, from the 19th-century women's movement to the commercialization of Mother's Day sales.

How Eurovision selects its winners

Competing acts are judged by a combination of music industry professionals, peers, and viewers, creating a suspenseful on-air tally to reveal the contest's ultimate winner.

The federal government uses the FAFSA to determine student's eligibility aid

Apply for billions of dollars in scholarships, grants, loans, and Federal Work-Study funds using the Free Application for Federal Student Aid form. Get an overview of how the FAFSA form can help you finance your education with money from the federal government, your state, and school; understand when to apply; and find out what you'll need to fill it out.

The two-day marathon meetings of the Federal Open Market Committee follow a logical process of information sharing

In a stately room in the Eccles Building in Washington, DC, the 17 participants of the FOMC and their aides report on economic conditions and decide monetary policy.

The US first hosted the World Cup in 1994, a tournament that lives in soccer infamy for its poor planning and the murder of Colombian player Andres Escobar, who'd accidentally scored on his own net.

The 1987 Nintendo video game 'Stadium Events' isn't known for being particularly fun, but its scarcity has made it a highly sought-after item that has sold for up to $35K at auction.

The United States is one of only around two dozen countries with a fully federal system of government, in which power is divided between national and state governments.

Gerrymandering works through two techniques: cracking opposing voters across districts to dilute their power, and packing them into a few to waste their votes in lopsided majorities.

Hear about the 250-year history of the United States Postal Service, complete with some of its strangest deliveries, important innovations, and the figures that made it an American institution.

Search a massive database of over 4 decades of clues from the TV quiz show 'Jeopardy!'

44% of Americans say they pray at least once a day—discover how your state's religiosity stacks up against the rest of the country.

Learn how to read a prospectus, the juicy document that any company must file with the SEC before going public.

Roughly 43 million US borrowers owe roughly $1.7T in student debt, the second-largest source of consumer debt behind mortgages.

Up to a million Girl Scouts sell about 200 million cookie boxes every spring, generating $800 million, largely because refusing a child is frowned upon

See how Budweiser's famous Clydesdales spend their days at Warm Springs Ranch, where roughly 70 to 80 of the beer brand's giant horses can be found at any given time.

A 2019 Facebook event called on attendees to "Storm Area 51, They Can't Stop All of Us," resulting in countless memes, the creation of a music festival, and eventually the arrests of those who did try to approach the area.

See how fireworks are made and learn how metals like magnesium and copper are responsible for different colors.

Take a 3D tour of the Hajj, Islam's annual pilgrimage to Mecca, undertaken by more than 1.5 million Muslims each year.

Visualize how CRISPR-Cas9—a type of immune system used by single-celled organisms to attack invasive viruses—targets and makes precise changes to a gene's DNA.

The first steps to rebuilding your credit score include getting to know exactly what's on your credit report and figuring out how far you are from the '700 club,' or 'good score' range.

View the ten deadliest tornadoes in US history.

Some coin denominations have ridges etched on their sides, partly to prevent counterfeiting, in a practice called 'reeding.'

While the sun's gravity keeps the planets in orbit, their gravity also pulls on the sun, causing it and everything else in the solar system to orbit around a mutual balance point called the barycenter—the true center of the solar system.

Explore the animals that populate the depths of the ocean, from fish and coral in the first few hundred feet, all the way down to the bottom of the Mariana Trench.

Researchers believe the brain consolidates memories, processes emotions, and plans for the future during dream states

'Grand Canyon of the Yellowstone,' a work by American painter Thomas Moran, inspired Congress to establish Yellowstone National Park.

Explore what it's like inside a patient isolation unit, used in situations such as treating a patient or suspected patient with Ebola.

While El Niño moves warm Pacific Ocean waters east along the equator, La Niña moves them west, shifting where rainfall will become more common for months.