But during testing, scientists didn't find this to be true. Instead, they noticed that the balls and bats' coefficient of restitution (COR), or a comparison of the objects' speeds before and after collision, remained similar throughout tests, leaving the energy exchange between the two materials almost the same. There's still, however, another reason players may have a soft spot for corked bats. Because they're lighter, the bats allow players to swing more quickly, which can result in making better contact with the ball and more hits or homeruns in the game. In this case, distance isn't the advantage - swing speed is.
Researchers also compared baseballs from the 1970s to those of 2004 and found little differences between the CORs of the balls, despite claims that modern balls are "juiced" to be more elastic.
The team also assessed whether temperature and humidity affect the physics of the game. Balls placed in controlled humid conditions to deter them from traveling farther at venues such as the high-altitude Colorado Rockies' stadium Coors Field were also studied. Despite other baseball myths coming up short, the team confirmed previous research showing that humidity and temperature lower balls' CORs and slow them down.