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.

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...

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.

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.

Exploring the Larry Bird punch that almost changed March Madness

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.

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.

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.

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 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.

"Guessing what the pitcher is going to throw is 80 percent of being a successful hitter. The other 20 percent is just execution."

- Baseball star Hank Aaron (1934-2021)

Murder rates spiked in the US after COVID-19, and then declined in 2023

Criminologist and former investigator Jillian Peterson says whether a murder is solved in the US is nearly up to the flip of a coin, with the clearance rate for murder cases being about 50%. The US, which has more guns than citizens, has about roughly five gun homicides per 100,000 residents, resulting in the 28th-highest rate of deaths from gun violence compared to the rest of the world.

The worst election polling fails in US history

Presidential pollsters in the US have had some embarrassing failures. Here’s a catalog of those miscalls, from the scholar who literally wrote the book on them.

The Millennium Prizes were created to spur solutions to seven unsolved problems

In 2000, the Clay Mathematics Institute brought public attention to the frontiers of mathematics by establishing $1M prizes for some of the most challenging problems mathematicians faced. As of 2025, only one problem has been solved, but the reward was turned down.

Use a prediction market profit or loss calculator

In order to calculate how much someone would make from a specific trade on a prediction market, this calculator asks for the purchase price of a given "yes" or "no" prediction, the number of contracts the trader plans to purchase, and more.

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.

Roughly one in every 250 has never remembered a single dream

Most people dream for about two hours every night and recall about two dreams per week, and memory encoding is especially fragile upon waking. Alarms can knock dreams right out of one's head, and dream recall may be influenced by personality, interest, and socialization.

The tournament in 2026 will have 48 teams

After 24 years of having a 32-team tournament, the FIFA World Cup will get an upgrade in 2026, expanding the field to make it the largest World Cup ever.

Mutual funds in seven broad categories averaged a 13.1% annual return in 2023

That 13.1% figure can help set expectations for how mutual funds will perform in 2024 and 2025, past performance does not guarantee future results.

Purdue students' robot solves a Rubik's cube faster than most people can blink

The solution time of 0.103 seconds is a Guinness World Record. A robot created by Mitsubishi Electric engineers held the previous record of 0.305 seconds.

The 16th-century astrologer Nostradamus' predictions for 2024

Nostradamus has been credited with predicting several major historical events over the years, but what does he think is in store for 2024? Read up on what his mysterious 1555 book, The Propheties, hints at for the upcoming year.

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

As of 2024, about 77% of the world's gold reserves have been mined

About 216 million metric tons—about 0.4% of the Great Pyramid of Giza's volume—have been extracted and used primarily for jewelry. The remaining reserves are estimated based on chemical analysis of rock samples extrapolated to the entire mass of Earth's crust.

Experts suggest there is a 10% chance AI will cause human extinction

AI superintelligence may hijack infrastructure, including power grids and transportation systems, if it surpasses human controls. It may also design unstoppable pathogens or deplete resources, like electricity, meant for human use.

Chaos gardening involves scattering seeds without any planning

The trend is intended to produce colorful, dense gardens by mixing various seeds. While encouraging experimentation and lower stakes, the success of these gardens depends on choosing plants with similar needs and incorporating native, nectar-rich flowers.

Chaos theory—informally known as the butterfly effect—is the reason why weather forecasts are presented with probabilities rather than certainties.

See a ranking of the best (and worst) Federal Reserve Chairs since 1914 out of the 16 men and women who have held the office since.

Indefinite cloning of some endangered species may not sustain their longevity because cloning success rates decrease as genetic mutations accumulate.

Calculate how much of your tax dollars go to each federal program based on your income, filing status, and number of children

Discover the catastrophic consequences of a failure of the US electrical grid—something that is more likely than many Americans think.

Bone marrow (soft tissue found inside certain bones) generates roughly 500 billion new blood cells each day

About 12.5% of US adults experience a phobia in their lifetime, a diagnosis that hinges on the intense fear interfering with daily life and persisting for at least six months.

Play the role of a student in a game where you try to navigate college and remain debt-free, selecting different income levels, high school experience, race, ethnicity, and more.

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.

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.

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

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.

When you complete a CAPTCHA on a website to prove you are human, you may be unknowingly training algorithms for self-driving cars, whose systems require training data to help identify crosswalks, bicycles, and other outdoor objects.

While atoms are normally made of protons, neutrons, and electrons, exotic ones have been built with antimatter—alternate versions of normal matter that live for fractions of a second and are about a billion times as rare.

Trace how the Bill of Rights, inspired by centuries of political theory, took shape between 1774 and 1789.

The Nasdaq's 'Magnificent 7' companies are responsible for roughly 40% of the Nasdaq 100 index's gains, while the remaining 93 companies account for the other 60%.

Apollo astronauts left items in the moon's 'toss zone,' including golf balls, family photos, and bags of human waste, to make room for lunar rocks.

Budweiser stores yeast derived from the original 1800s strain in a secret bunker, which only the Head of Yeast Management can access—not even the CEO

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

As of 2025, the most cited papers in science include a review of graphene, methods to improve image recognition, streamlining electron density calculations, and optimizing protein studies.

Explore our favorite visualization of the immense scale of space, from an astronaut to the size of the observable universe

The term 'algorithm' originated from the Latinized name of al-Khwārizmī, a 9th-century mathematician whose works introduced Arabic numerals and the decimal-based numeral system to Europe and whose treatise 'Al-Jabr' gave algebra its name.