Baseb.a.l.l.s were originally homemade and baseball was originally only played by milkmaids (women who milked cows). The old baseb.a.l.l.s were made of brown leather and also had a solid core. It also wasn't feasible to make them perfectly round.

At one it was part in time, it wasn't against the rules to pelt other players with a baseball (they were however far lighter).

They litteraly rub mud on white b.a.l.l.s to give the pitchers more grip and control... (it's even done in major league baseball).

Almost 160,000 baseb.a.l.l.s are used per regular season.