The Exploratorium in San Francisco offers this extensive site that looks into many aspects of baseball. It will take almost as long as a baseball game lasts to investigate everything on the site. See if you can hit a 90 mph fast ball, read about how the human body can react to the speed of a baseball and actually hit it, and do some of the activities that will help you understand the science behind baseball. In addition, you can find out about the women in baseball, all the way back to the 1920s. Pick a famous baseball player and see how his statistics would change over different time periods. Play ball!
courtesy of Knovation