Some scientists ran studies to determine the effect of certain conditions on the flight of a baseball. 1. Corking a bat has no noticeable effect on increasing the flight of a ball. Although it may help a hitter make contact more often. 2. They took balls from many different seasons and there was no definitive proof of any being 'juiced' 3. Humidity (or using a Humidor to store balls) can have a significant effect on the flight of a ball. Even a small increase in humidity (30 percent to 50 percent) can shorten the total length of a batted ball.