Why baseballs fly farther and curveballs break less in Denver, how the Rockies' ballpark was built to cope, what the humidor changed, and what the historical park factors show about Coors Field from 1995 through 2025.
How the catcher went from squatting bare-handed behind the plate to wearing a mask, chest protector and shin guards: the history of each piece, why it was added, and what the modern kit does.
What is inside a baseball, from the cork and rubber core to the wool yarn, the cowhide cover and the 108 hand-sewn stitches, plus the rule book limits, the science of the bounce and the differences between pro and youth balls.
How a major-league wooden bat goes from a log to a finished model: the three woods and how they behave, the lathe, the rules a bat must meet, and what to look for in care and safety.
How baseball learned to measure every pitch, from radar guns and QuesTec to PITCHf/x, radar-based Statcast and Hawk-Eye cameras. What the systems measure, how they work, what they changed and where they fall short.
How baseball went decades without batting helmets, the injuries that changed minds, the rules that made them universal, how a helmet works, and what hit-by-pitch data and youth guidelines say today.
How the baseball glove went from bare hands and thin leather pads to the pocketed, position-specific tool of today, what the historical error counts show, and what the rules allow.
Why a curveball curves: the Magnus force on a spinning baseball, how spin direction sets the break, why the break seems to come late, and how air density and altitude change the pitch.
What makes a baseball leave the park: exit speed, launch angle, backspin, drag and the density of the air. Worked examples show why altitude, temperature and the ball itself change how far a fly ball travels.
How a 1974 experimental operation on a Dodgers pitcher became a routine fixture of professional baseball, with Tommy John's own career in the historical record, the typical recovery timeline and what workload data can and cannot show.
4Baseball is an independent site and is not affiliated with, endorsed by or sponsored by Major League Baseball, Minor League Baseball, the NCAA, USA Baseball, USA Softball, Little League International, or any club, league or school. Club names, logos and marks are the property of their respective owners and are used here for identification only.