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Basketball was invented by Dr. James Naismith, a Canadian physical education instructor, in December 1891 at the International YMCA Training School in Springfield, Massachusetts. Assigned to occupy an unruly class through the New England winter, he designed an indoor game with 13 written rules built around a deliberately elevated goal — a peach basket nailed 10 feet up — so that scoring required skill and arc rather than force. Running with the ball and rough contact were banned from the start. The first game, played nine-a-side, ended 1–0 on a single basket by William Chase. The 10-foot rim height, an accident of the balcony railing's elevation, has never changed, and Naismith lived to see his invention become an Olympic sport at Berlin in 1936.

The NBA plays four 12-minute quarters, FIBA four 10-minute quarters. The NBA three-point line reaches 23 feet 9 inches at the top (22 feet in the corners); FIBA's arc is a uniform 6.75 meters, about 22 feet 2 inches, which is one reason percentages rise in international play. FIBA allows players to touch the ball once it hits the rim — goaltending rules that produce legal tip-ins the NBA forbids — and has no defensive three-second rule, so shot-blockers may camp in the lane, making interior space far more congested. Players foul out on five fouls in FIBA rather than six, the court is slightly smaller, and coaches cannot call timeouts during live play. These differences explain why NBA stars often struggle initially in Olympic and World Cup basketball.

A triple-double means reaching double figures in three statistical categories in one game — almost always points, rebounds and assists, though steals or blocks can qualify. It signals all-around dominance rather than specialist scoring. Russell Westbrook holds the career record with 200 regular-season triple-doubles, having passed Oscar Robertson's mark of 181 in 2021; Westbrook also averaged a triple-double across an entire season four times, a feat previously achieved only by Robertson in 1961–62. Nikola Jokić has made the triple-double a center's statistic, regularly producing them in the playoffs, while Wilt Chamberlain remains the only player with a double triple-double — 22 points, 25 rebounds and 21 assists in 1968. The statistic's prestige has grown with the modern game's emphasis on positionless, multi-skill play.

Bill Russell won 11 championships in his 13 seasons with the Boston Celtics between 1957 and 1969 — the most by any player in NBA history, and a record considered effectively unbreakable given modern free agency and parity. His teammate Sam Jones is second with 10. Among modern players, Michael Jordan and Scottie Pippen won six together in Chicago, Kareem Abdul-Jabbar won six across Milwaukee and the Lakers, and Robert Horry won seven as a role player with three franchises. At franchise level, the Celtics lead with 18 titles after their 2024 championship, one ahead of the Lakers' 17. Notably, the years 2019 through 2025 produced seven different champions — the longest run without a repeat winner in league history.

Arithmetic. A three-pointer made at 36 percent yields 1.08 points per attempt — the same as shooting 54 percent on twos, a level almost no jump-shooter reaches from mid-range, where league accuracy sits near 42 percent. Once analytics departments quantified this in the late 2000s, the mid-range jumper was systematically replaced by shots at the rim, free throws, and threes — a shot diet nicknamed Moreyball after Houston executive Daryl Morey, whose 2017–18 Rockets became the first team to attempt more threes than twos. League-wide attempts rose from 18.0 per team per game in 2010–11 to 37.6 in 2024–25. Stephen Curry accelerated the shift by proving pull-up threes off the dribble could anchor a championship offense, forcing defenses to extend and opening the entire floor.

The shot clock gives the offense a fixed window — 24 seconds in the NBA, FIBA and WNBA — to attempt a shot that hits the rim, or possession is forfeited. It exists because early professional basketball had a stalling problem: with no time limit, leading teams simply held the ball, culminating in the Fort Wayne Pistons' notorious 19–18 win over the Minneapolis Lakers on November 22, 1950. Syracuse Nationals owner Danny Biasone championed the fix, calculating that teams averaged about 60 shots a game each — 24 seconds per possession across 48 minutes — and the league adopted it for 1954–55. Scoring immediately jumped by roughly 14 points per game. A later refinement resets the clock to only 14 seconds after an offensive rebound, adopted by FIBA in 2014 and the NBA in 2018 to further accelerate play.