Why professional tennis players are so picky about balls before serving

Tennis' weirdest rule (only for women)

At all but one Grand Slam, men and women played with the same tennis ball. But at the US Open, women were required to use a different ball until a change was made a few years ago. We break down the story behind that strange anomaly.

Sir David Attenborough suggested tennis balls be yellow

When you think of tennis, it's the iconic yellow ball, but tennis balls didn't always look like that. This Merchant of Tennis article explores the early tennis balls made from wood in the 1300s, to leather balls, to vulcanized rubber used in the late 1800s. Crucially, Sir David Attenborough worked to broadcast the 1967 Wimbledon Championships in color, leading to tennis balls changing from white to yellow.

Why do tennis players always wear white?

Why does Wimbledon still enforce its strict all-white dress code while other major tournaments have embraced color? The answer lies in history, tradition, and even branding. From its elite origins in the 1800s, to modern-day rule changes, discover why this policy remains one of tennis’ most enduring customs.

Tennis can be played on clay, grass, hard court, or carpet

Tennis started on grass surfaces in England, but as the sport has grown, so have the surfaces used to play the game. This article details how each surface affects ball speed, bounce height, and player movement, and highlights which Major championship uses which surface.

Turbulence is needed to make airplanes more stable and golf balls fly farther

Vortex generators—small fins placed along airplane wings—create small eddies that prevent airflow separation, maintaining lift and preventing stalls. Golf balls have dimples that create a turbulent boundary layer on their surface, minimizing drag forces.

Every baseball used by the MLB lasts about seven pitches

Handmade in Costa Rica, the balls meet strict MLB specs: cork or rubber cores, wool yarn, Tennessee cowhide, and 108 stitches. Before play, they’re coated in Lena Blackburne mud from a secret New Jersey spot, ensuring grip and consistency for the big game.

PIckleball's popularity with seniors is partially due to its health benefits

Pickleball has always been a game for all ages, but it has been particularly popular among seniors, in part because of its many health benefits, including enhancing hand-eye coordination and burning more calories than walking.

NFL kickers are kicking the ball farther than ever before

A combination of training, technique, and new rules regarding equipment has led to a sharp improvement in kicking since 2020. Certain players are now allowed to keep footballs with them throughout the practice week and play with a ball of their choosing during games.

What happens to golf balls after they're used?

With over 1 billion golf balls produced annually, an estimated 300 million to 1.5 billion are lost worldwide. On average, thousands of balls are left behind on each course, often ending up in ponds, forests, and beaches. While many golf courses recover and reuse some of these balls, studies suggest countless remain unretrieved.

Some athletes warm up with equipment from other sports

Baseball superstar Shohei Ohtani uses a cricket bat; his teammate Yoshinobu Yamamoto throws a javelin. Quarterback CJ Stroud shoots free throws. The reasons are partially physical (it's good to exercise different parts of your body) and partially mental (it's nice to take the pressure off with someone else's game).

A pickleball's loud 'pop' sound can reach 120 decibels, which is equivalent to a hammer hitting a nail

The physics of baseball pitches

To a nonfan, pitching a baseball may seem straightforward. Dive into the ridiculous physics of throwing a baseball at high speeds, from curveballs to sliders and more, and learn just how crucial those classic red seams of the baseball are in determining what the ball does in the air.

Tennis match interrupted by 'Cotton Eye Joe'

Tennis players require extreme focus as they volley on the court, and officials typically enforce significant noise standards during play. So it was quite a shock when the 1995 hit "Cotton Eye Joe"—as recorded by Swedish Eurodance band...

Winter Olympic sports highlight various laws and principles of physics

Figure skaters leverage the conservation of angular momentum during spins by tightening their bodies, and the skintight suits used in ski jumping help reduce drag. Centripetal force allows speedskaters to make tight turns, while friction on skis helps ski mountaineers climb slopes. No action can violate the conservation of energy.

Axelle Berthoumieu bit Ireland's Aoife Wafer during the Women’s Rugby World Cup quarter‑final in 2025

Biting, waxing pool balls, and modifying ski suits are just a few of the various instances of bad sportsmanship in 2025. It appears that cheating is much harder to get away with in the era of smartphones.

F1 drivers today are in peak physical shape

Formula 1 drivers today are in top physical condition, with reaction times on par with Olympic sprinters and strength programs specifically for their neck to withstand the immense g-forces experienced in racing.

The 2026 season will be the first to allow challenges on balls and strikes

The Automated Ball Strike (ABS) technology—first tested in the minor leagues and in MLB's 2025 spring training and All-Star Game—defines the strike zone rather than relying on individual umpires' interpretations of it. Rather than allowing ABS to determine every ball or strike, though, each team will now have a limited number of in-game challenges to umpires' calls, which will be settled by ABS.

Exploring why the PGA Tour's rivalry with LIV seems to have cooled

This analysis by Dan Wetzel suggests that LIV's initial threat to the PGA Tour's dominance in golf has faded, with several golfers leaving LIV to return to the PGA Tour.

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.

Generally, NBA basketball teams whose players touch each other more win more games

This 2010 research finding underscores the importance of touch in promoting trust, bonding, and cooperation, thereby apparently improving team success. Touch also promotes cooperation in other settings: In a separate "prisoner's dilemma" study, when the experimenter gently touched some participants with a quick pat on the back, the touched individuals were more likely to cooperate and share with their partner.

Power lines are dotted with large, brightly colored balls to improve the visibility of these thin wires to helicopters and small planes and help prevent potential crashes.

Counting calories with a ballerina

Ballet dancer Theresa Farrell meticulously manages her diet to achieve her performance weight goal for the American Contemporary Ballet season in Los Angeles. She tracks calories, relies on pre-packaged meals, and calculates every intake. This regimen allows her to stay focused on training and rigorous dance routines, ensuring she's prepared physically for performances. Watch a day in the life here.

'Reputation is what others think about you. What’s far more important is character, because that is what you think about yourself.'

- Tennis champion Billie Jean King (1943-present)

Leagues like the Premier League differ from the World Cup

The Premier League and other similar club leagues are professional organizations like the NFL or the NBA, where owners purchase player contracts. World Cup teams, on the other hand, are organized by citizenship.

Breaking down the jargon and strategy of horse betting

Placing bets on horse racing isn't the same as a football or basketball game. You can pick a winner (win), who will come in second (place), and even third (show). And all the bets placed on a race are pooled together and divided among the winners. This Top Ten Picks video teaches the mechanics behind each bet, and shares insider tips that can lead to more informed betting choices.

To reduce wrinkles in clothing, research recommends gentle wash cycles with more water and tumble drying with smaller loads and longer times.

Chess can be played at lightning-fast or classical speeds

Time controls shape how the game is played—from bullet matches under three minutes, to blitz games under 10, to classical contests lasting over an hour. Each format demands different skills, from rapid intuition to deep calculation.

To reduce wrinkles in clothing, research recommends gentle wash cycles with more water and tumble drying with smaller loads and longer times.

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.

Explore chaos in this simulation of two double pendulums, where small differences in the release angles produce wildly different outcomes.

Stars appear to twinkle because turbulence in the motion of molecules in Earth's atmosphere causes light to bend and wiggle rapidly on its way to the surface—a phenomenon called scintillation.

Fear or disgust related to clusters of holes and cracks, called trypophobia, may stem from evolutionary processes to help us avoid pathogens.

Double world record holder Hunter Ewen helped conquer his fear of balloons, called globophobia, by training to win Guinness World Record titles for balloon inflation.

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.

Brandi Chastain, the star of the 1999 US victory over China in the 1999 Women's World Cup, was a last-second choice to take the penalty kick that sealed the victory.

Long before Major League Baseball began allowing instant replay for balls and strikes, an umpire reluctantly used the technology to determine whether a hit was a home run, a move that inadvertently ushered in a new era for the sport.

Hedge funds, the private investment firms that trade a wide swath of financial assets, make money by imposing steep fees on investors and from the fund's investment performance.

Watch how algorithms can be designed to train themselves and self-improve without human input, to the point where the optimized code is too complex for programmers to understand.

Scientists testing how climate change affects plants found, in a years-long simulation study, that poison ivy grew 70% faster with the resulting extra carbon dioxide.

American short story writer Flannery O'Connor raised 40 peacocks, which became potent symbols for her fiction's elegant violence

Watch the cumbersome, but necessary, precautions healthcare workers must take to care for and protect themselves while caring for Ebola patients.

Sony set the standard for cylinder-shaped batteries when it repurposed manufacturing equipment used to make rolls of magnetic recording tape.

Before the current East Wing ballroom project, only two White House renovations in the past 100 years cost more than $10M.

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.

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

The word 'jazz' evolved from 'jasm,' 19th-century American slang for 'energy'

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

SpongeBob exemplifies Aristotle's philosophy for living well because he understands that happiness doesn't come from external factors like money, recognition, or power.

Pure water does not conduct electricity because this flow of energy requires the movement of charged particles, and water is a neutral molecule.

Brian Wilson wrote the Beach Boys' 'Don't Worry Baby' for the Ronettes, but the legendary girl group rejected it.