CTE is a major threat to NFL players

A week before Super Bowl LVII, Boston University released findings from a study diagnosing 91.7% of former NFL players in their 376-person study with chronic traumatic encephalopathy. It was a stark comparison to the less than 1% of CTE diagnosis in non-football players.

Following the NFL's concussion settlement, numerous victims were denied payouts.

Repeated head injuries, which may occur in collision sports at the youth, amateur, and professional levels, can lead to CTE and early dementia.

Retired professional soccer players are showing signs of potential neurological impacts in midlife, according to a study presented at the July 2026 Alzheimer's Association International Conference in London.

Sports leagues have attempted to prevent athletes from betting

As pro and collegiate sports embrace betting (and the revenue that comes with it), each league works diligently to ensure the integrity of the games by hiring private firms to analyze irregular bets. These companies have flagged bets that led to the firing of Alabama’s baseball coach, the suspension of multiple athletes at Iowa and Iowa State, and, most recently, a lifetime ban on former Toronto Raptors forward Jontay Porter by the NBA in April 2024.

The biggest controversies of the NFL

Some of the biggest controversies in NFL history didn’t just spark debate—they changed the game. From Spygate and Deflategate to concussion research and the league's ambivalent stance on it, these moments led to new rules, safety measures, and major policy shifts. Explore how each scandal shaped the league and its future.

National Hockey League, explained

Founded in 1917, the NHL started with four Canadian teams and now spans 32 franchises across North America. Its iconic Stanley Cup, first awarded in 1893, remains a unique prize, with winners' names hand-engraved each year. The league generates billions in annual revenue, aided by key expansions, lucrative TV deals, and global fan engagement. While player safety and labor disputes have posed challenges, the NHL remains a cornerstone of professional sports, offering an 82-game season culminating in the fiercely contested Stanley Cup Final.

NHL players used to not wear helmets or masks

Until the 1970s, hockey goalies didn't wear masks to protect their faces with any regularity. Instead, they took pucks off their cheeks, foreheads, and mouths, resulting in serious scars. Any player who entered the league after June 1, 1979, was required to wear a helmet, but several players who'd started before then chose to continue playing without one.

​​Some allege the NFL has shifted gameplay toward fantasy

Recent rule changes in the league have increased passing and point-scoring, which critics argue is motivated by a desire to appeal to fantasy-loving viewers who might be frustrated by slower, lower-scoring games.

Hockey enforcers are players responsible for guarding against aggression from the opposing team

From the 1980s through to the early 2000s, enforcers were a regular part of NHL lineups. At 6 feet 7 inches, Derek Boogaard’s body was made for the part, but he was found to have suffered from CTE after his tragic death at 28. Stories about Boogaard helped dramatically reduce enforcers in hockey and opened discussions for player safety.

Even athletes aren't immune to the sports-betting craze

While gambling scandals occasionally blew up before 2018, the widespread legalization of sports betting provided athletes with more opportunities to bet on the games they were playing.

NFL Draft decisions are shaped by brain science, data, and office culture

Carnegie Mellon researchers say Draft-room choices are influenced by the "jackpot effect"—where higher stakes can impair performance—as well as by groupthink, the limits of data, and whether scouts feel safe speaking up.

Major League Baseball, explained

Major League Baseball is America’s oldest professional sports league. Alongside triumphs, the league has faced scandals, including drug abuse and steroid use, shaping its path over the decades. Today, MLB embraces new rules, international talent, and a growing connection to legalized sports betting.

Among most mainstream sports broadcasts, sports betting ads appear most often in women's basketball and hockey

A random selection of 50 different sports broadcasts tracked one sports betting reference every four minutes. In one of the randomly selected hockey games, the longest stretch of no gambling reference lasted about five minutes towards the end of the game.

Mental health experts caution against youth sports betting

People in their early 20s represent the fastest-growing group of sports gamblers. That fact concerns mental health professionals, who warn that early exposure to gaming primes children’s brains to seek digital rewards.

NHL player Craig MacTavish was convicted of vehicular homicide in the middle of his career

In January 1984, Boston Bruins center Craig MacTavish was driving home after a practice while under the influence of alcohol. He struck a car driven by Kim Radley, who died four days later. MacTavish was sentenced to a year in prison before resuming his career in Edmonton.

Korey Stringer, of the Minnesota Vikings, died of heat-related illness in 2001

In response, the NFL overhauled its heat approach and no other player has since died from heat-related illness. Even at the high school level, research suggests safety measures should include: mandating water breaks, keeping a cool tub available, and having athletes acclimate to high-temperature playing conditions for a week or longer before donning the full set of protective equipment.

The greatest NHL rivalries

In its over 100 years as a league, the NHL has developed several heated rivalries, from the classic Canadian grudge matches between Toronto and Montreal to the Keystone State nemeses in Philadelphia and Pittsburgh. This list ranks the best and most bitter matchups, often tracing their animosity back decades.

Teddy Roosevelt's intervention helped save football, which previously had been a brutally violent game.

The NFL is so successful because it is perfectly suited for television

The predictable weekly cadence of football games ritualizes the experience of watching together, and their relative scarcity makes every game meaningful. With the stop-and-go play of the sport, there are predictable, repeating stoppages to allow broadcasters to sell lots of advertising inventory. The league sits in the sweet spot compared to MLB (many games) and NBA and soccer (continuous play with fewer ads). This Acquired episode distills fascinating insights into the NFL's business and history.

MLB pitchers were charged with benefiting from sports betting

In November 2025, two pitchers for the Cleveland Guardians were charged with coordinating with sports bettors to enrich themselves and others. In many instances, they shared the kinds of pitches they would throw at specific points in the game. Bettors then placed money on those actions.

1440: The National Football League

Explore the best resources we found on the NFL

NFL explained

The NFL is the premier professional American football league, founded in 1920 in Canton, Ohio. It consists of 32 teams playing an 18-week regular season from September to January, culminating in the Super Bowl championship in February. The NFL has grown into the world's most valuable sports league, generating nearly $20B in revenue in 2023, and with teams valued at $163B combined. Learn its history here.

Traumatic brain injury is a leading cause of brain death—and TBIs are trending up

Traumatic brain injury-related deaths have generally increased between 2000 and 2023, growing from roughly 49,000 to more than 68,000 in 2023. Firearm-related suicide is the most common cause of TBI-related deaths in the US, according to the Centers for Disease Control and Prevention. People also experience TBIs from falls, motor vehicle crashes, or assaults.

A 2024 cheating scandal cast doubt on the industry

In 2024, National Fantasy Football Championship, a fantasy league with big payouts, fired one of its employees for manipulating data. The episode cast doubt on the relatively unregulated industry, despite the league coming down hard on the nefarious worker.

Fantasy sports can have adverse health effects

Experts warn that fantasy sports, including fantasy football, can encourage obsessive use because they offer hits of dopamine. Daily fantasy games, which function more like gambling, are especially problematic.

Pete Rozelle made football an American obsession

There have been eight NFL commissioners in the league’s 100-plus year history, but none of them changed the league quite like Pete Rozelle. This 1984 New York Times Magazine profile looks back at the substantial changes Rozelle brought to the league since he took the job in 1960, as well as the challenges he faced while in office.

100 years of NFL history in under four minutes

Founded in 1920 in Canton, Ohio, professional football has grown into the premiere sport in the US. Generating more than $20B annually, the NFL gained significant popularity after merging with the American Football League in 1970, a move which among other things established the Super Bowl.

A tragic injury led to the original NHL All-Star Game

The annual NHL All-Star Game is a joyous affair celebrating the best players each season. But its origins came from one of the most terrifying moments in hockey history. In a 1933 game, Maple Leafs wing Ace Bailey was nearly killed on the ice, and the NHL organized a benefit game to raise money for his family.

In 1985, New York Mets star Keith Hernandez said 40% of his MLB peers used cocaine, highlighting an open secret about drug use in the league.

'Moneyball' author Michael Lewis believes sports betting is a problem for young men

The noted journalist and author of "Moneyball," "The Big Short," and "The Blind Side" has now fixed his discerning eye on the sports-betting industry. In this interview, he explains why he sees sports betting as a problem for American society, especially boys and young men, and why he believes the government needs to regulate the nascent industry more seriously.

NBA players are the best paid athletes in major US sports

The NFL is the most valuable pro league in the world, but its players aren’t making nearly as much as NBA players. This CNBC video dives into how league structure, salary cap, and guaranteed contracts define how much an athlete will make, and shows how NBA players are able to use those to get almost double the average annual salary of other pro leagues.

Sports media have also embraced sports betting

For decades, ESPN kept its distance between reporting on games and talking about gambling lines. Sports teams refused to have franchises in Las Vegas, fearing it would harm the sport. But since 2018, that has changed. ESPN’s personalities regularly pick games, and the company has also launched its own betting app.

The Spanish flu had a major impact on the 1919 NHL season

Just two years after the National Hockey League was officially formed, its champion was playing the PCHA champion for the Stanley Cup. The series was tied, going into the deciding Game 5, when all but three NHL players fell ill with the Spanish flu. No champion was crowned that year.

The gray area that makes PEDs seem like leveling up to hardcore athletes

Doping in sports is broadly condemned as unsafe and unfair. Significant controversies in major sports, including baseball and cycling, have been prompted by the widespread use of performance-enhancing drugs, which are described as clear-cut dangers and abuses of the rules. But to many competitors, the line between a PED and the next smart technique to adopt is unclear. This podcast episode explores that gray reality.

Tim Donaghy and the NBA game fixing scandal

A two-year investigation by ESPN details how former NBA referee Tim Donaghy conspired to fix games, who he was working with, and where the money was going. In a lengthy statement, the NBA denied much of the new claims in the article, saying the data ESPN used was not strong and they were unable to replicate it. Donaghy was given a lifetime ban and served nearly all of his 15-month sentence.

John Riddell’s first helmet was adopted by college football teams in 1939

The early days of football were violent and there was little protection for players, especially their heads. When deaths became commonplace, John Riddell set out to invent a better way to protect football players. Eventually, the technology from Riddell’s helmets ended up on WWII battlefields.

Hockey romance novels have become an unexpected sensation

The combination was not an obvious hit, but books like "Hockey With Benefits," "Body Check," and "Puck and Prejudice" (a Jane Austen fan fiction) have grown popular thanks to a romance novel boom and an interest on TikTok. Now, HBO and Amazon are taking note with streaming adaptations. (Some readers may experience a paywall.)