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

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.

How March Madness Selection Sunday works

March Madness is one of the most popular American sporting events, but most viewers aren't aware of how its 68 teams are selected for the prestigious national tournament. This official process overview breaks down how the teams are selected, seeded, and placed into the bracket. Knowing the ins and outs might not stop you from disputing the committee's selections, but at least you'll understand how they came to those decisions.

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.

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.

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.

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."

Guess US city populations via bracket-style game

The US Census Bureau's data visualization team created a game—laid out like a March Madness basketball bracket—where you try to decide which metro area of two has the greater population. Test your knowledge of relative city populations and see...

Ranking ten of the best March Madness buzzer-beaters

There is nothing like the thrill of an NCAA March Madness buzzer-beater–particularly if it's a Cinderella upsetting a top-ranked team. This SI.com article ranks 10 heart-stoppers, going back to 1981. Relive Keith Smart's 1987 dagger, Bryce Drew's prayer in 1998, Kris Jenkins' 2016 title-winner, Lorenzo Charles' 1983 dunk, and, of course, "the Shot" in 1992.

In a standard deck of 52 cards, shuffling produces one of approximately 8.07 × 10⁶⁷ potential card orders—a number about as large as the number of atoms in the Milky Way.

See some of the greatest individual performances in March Madness history that ended with a championship

Bleacher Report ranks the greatest individual tournament runs in history, from Kareem Abdul-Jabbar's 1968 dominance to Carmelo Anthony's 2003 freshman heroics, counting only performances that ended in a national championship.

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.

How math whizzes exploit sportsbooks

Chris Dirkus is a professional sports bettor who approaches the hobby as a math problem, not from a fan's perspective. He focuses on mispriced odds in popular games where many fans are betting for high liquidity. He's one of a rare segment of sports bettors exploiting slow models and human mistakes.

20 years of NCAA buzzers

The last few beats of the March Madness title game are among the most thrilling in sports. This video compilation collects the final five seconds of every women's championship from the first year of the tournament through 2022. The result is a fascinating document of celebrations, disappointments, and last-ditch efforts. It's also objective proof that basketball's style has evolved considerably over the decades.

UMBC became the first 16-seed to ever beat a 1-seed, pulling off the biggest upset in March Madness history

In 2018, UMBC defeated the overall No. 1 seed Virginia 74-54, ending a 0-135 record for 16-seeds against 1-seeds and turning what was expected to be a blowout into one of the most unlikely results in sports history.

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.

Relive the best moments from March Madness 2025

Florida won its first national title since 2007, beating Houston 65-63 in a tournament where all four No. 1 seeds reached the Final Four for only the second time in history.

There are more chess game variations than observable atoms in the universe

Mathematician Claude Shannon estimated there are 10 to the 120th power variations of chess games possible. Known as the "Shannon number," this is more than the estimated number of atoms in the cosmos.

'Scorigami' attempts to chart every NFL game score

The rules of the sport set bounds on possible final outcomes, so this adept statistician mined some fascinating takeaways. Some scores are impossible (like 5 to 1) and some are more common (like 20-17, occurring over 300 times since 1944). Watch for a deluge of numbers.

In mathematics, a 'perfect number' is equal to the sum of the numbers it is divisible by, excluding itself, such as 28, which can be evenly divided by 1, 2, 4, 7, and 14, and 1 + 2 + 4 + 7 + 14 equals 28.

Five years after UMBC, Fairleigh Dickinson defeated Purdue to become the second-ever 16-seed to beat a 1 seed.

Five years after UMBC shocked Virginia, FDU pulled off an even more improbable upset. Ranked last out of all 68 tournament teams and a 23.5-point underdog, the Knights stunned Big Ten champion Purdue 63-58.

Prediction markets and sports betting are not forms of investing, despite how some fans portray them.

Americans spent nearly $150B in sports-related bets in 2024

These bets ranged from who would win the World Series to what color clothes famous celebrities would wear to the Super Bowl. Experts believe the industry will continue to grow.

The idea that the median estimate of a group can be more accurate than individual expert estimates is called the 'wisdom of the crowd,' and dates back to the early 1900s.

As of 2022, scientists estimate that 117 billion people have been born on Earth

Although no demographic data exist for more than 99% of the time humans have existed, this value can be estimated by tracking approximate population sizes over different periods and the birth rates within those periods. In 2022, about 6.8% of humans that have ever been born were alive.

Where you fall on the sports misery index

Only one team can win it all each season, which means the majority of fans are disappointed. This bot mines the data on how your teams have performed in recent years and measures your misery index (the higher, the more miserable).

How the number 15 solved a longstanding math challenge

The “packing coloring” problem asks how many numbers are needed to fill an infinite grid so that identical numbers never get too close to one another. A new computer-assisted proof finds a surprisingly straightforward answer—only 15. While...

One reason Americans are bad at math

The president of Barnard College explains why we need to better understand the links between math anxiety, math avoidance, and the US’s dismal test scores.

Calculate your chance of success for IVF treatments

The efficacy of in vitro fertilization procedures varies widely based on age, health history, genetics, and more. This CDC calculator provides an estimate of success rates based on your personal information, relying on thousands of reported outcomes across the US.

Only about 0.0001% of sperm, on average, successfully reach the uterine cavity

We've evolved to make pregnancy a complex and difficult process. From the initial development of the blastocyst, to the energy and nutrients needed to grow a new human, our bodies are both fighting and supporting fetal development.

The most bizarre numbers in the universe

Even for math-y types, some numbers are incomprehensible. This article dives into several kinds of numbers more complicated than even irrational numbers with endless decimals like "pi" or Euler's number: Noncomputable numbers. Read the bizarre...

Florida Gulf Coast became the first 15-seed ever to reach the Sweet 16 with one of March Madness's most electrifying runs

In only their second year of full NCAA eligibility, FGCU upset 2-seed Georgetown and 7-seed San Diego State with flashy alley-oops and fast-break dunks-(earning the nickname "dunk city") becoming the first 15-seed in history to reach the Sweet 16.

More than $100M in scholarships goes unclaimed each year

More than $50B in scholarships are awarded each year, though analysts estimate more than $100M goes unclaimed due to a lack of qualified applicants. That fact should be unsurprising given the dizzying number and criteria for thousands of applications. This portal from the US Department of Labor lets you quickly search more than 9,600 scholarship opportunities by program, eligibility criteria, and more.

You are 65,000 times more likely to be struck by lightning than to be hit by space trash

In 2023, about 1,500 pieces of space junk fell to Earth, with most consisting of payload fragmentation debris. The vast majority that falls back to Earth burns up before reaching the surface, making it three times less likely to be struck by space trash than by a meteorite.

The 2024 US presidential election was a breakthrough moment for prediction markets

Founded in 2018 by MIT graduates, Kalshi won a federal appeals court ruling in October 2024 that allowed it to offer election contracts in the US. When prediction markets predicted President Donald Trump's win (more accurately than most polls), prediction markets were thrust into the public eye.

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.

Some experts equate prediction markets to the new crack cocaine of gambling addiction

An addiction psychiatrist at UCLA says betting apps are far more potent than traditional gambling, citing a 19-year-old patient who lost $180,000 and hadn't left campus in a year, cycling through sports bets, crypto, meme stocks, and prediction markets on his phone. This interview explores the extreme edge of the nascent industry.

What it means to call a bracket 'chalk'

If the tournament is rather boring, you might hear a curious word getting thrown around: "chalk." In short, it means that the favorites have been winning. The word's origins go back to horse racing and its sportsbooks, where bookies would post odds on chalkboards. Over time, the bookies came to be known as "chalk" and, years later, tournaments (and their brackets) that seemed to favor those bookies earned the name, too.

Predicting earthquakes is difficult because different rock types can withstand different amounts of stress before breaking and melt at different temperatures within Earth's interior, introducing uncertainty into predictive models.

The betting scandal that rocked college basketball

In the 1940s and '50s, illegal bookmaking in college basketball was rampant at Madison Square Garden. In the 1949-50 season, City College of New York players shaved points during games, though they played honestly in the NIT and NCAA tournaments, winning both. This OddsShark.com article explores how the points-shaving scandal was exposed, who went to jail, and its impact on the NIT and CCNY.

Modern prediction markets—the platforms where people can trade bets that pay out depending on certain event outcomes—started in Iowa in 1988.

In 2000, the Clay Mathematics Institute placed million-dollar bounties on seven unsolved problems in mathematics—the Millennium Prize Problems—in the hopes of spurring solutions.

Although there are 10,000 possible combinations of four-digit personal identification numbers, data suggests that about 27% of all PINs are one of 20 combinations, including 1234, 1111, and 0000.

Women are born with all the eggs they will ever produce in their lifetimes

Girls are born with an estimated 1 million to 2 million eggs in their bodies, but around 10,000 die monthly before girls hit puberty. Scientists have not yet figured out why there's such an excessive number of eggs prior to menstruation, but they've calculated that there are roughly 300,000 to 400,000 eggs left at puberty.

Play a game that reveals if investors with a crystal ball make better trades

The "crystal ball" game reveals how well you would do trading stocks and bonds if you could see the front page of the Wall Street Journal one day in advance.

High demand forces H-1B visas into a lottery system each year

Because demand far exceeds the annual cap—65,000 new visas plus 20,000 for US master's graduates—employers must enter a lottery for new H-1B slots. In recent years, several hundred thousand petitions have competed for just 85,000 openings.

Inside MLB's robo-umping experiment

Human umpires call roughly 94% of pitches right overall, but performance reduces on borderline pitches in high-leverage moments, the calls that shape game outcomes most. A professor and historian analyze early experiments with the full "robot ump" system that helped shape MLB's decision to implement a compromise "challenge" system.

Experts suggest the industry could be a $45B business

Sports betting used to primarily consist of who would win and the points spread, but the rise of online betting apps has fueled a substantial increase in parlay bets. "Existing markets are still growing at a rapid clip," said Noah Naparst, who evaluates sports-betting companies for Goldman Sachs. "So we’re not mature yet, but we’re not in the early wildcat days of the market anymore, either.”

An estimated 49 million people played fantasy football in 2022

The number, estimated by the Fantasy Sports and Gaming Association, has grown exponentially since the start of the century. While fantasy sports in general are popular, football is the most popular, with an estimated 79% of fantasy participants playing fantasy football.

The best wrong answers from 'Jeopardy!'

“Jeopardy!” is known for its geniuses, but that doesn’t mean every minute of the show is an illustration of brilliance. This compilation corrects some of the funniest incorrect responses from contestants, making for over 10 minutes of hilarity.