National Marble Day: A Look at the Manufacturing of Glass Marbles

  The blog content comes from the NIOSH Manufacturing Mondays series. July 23rd is National Marble Day.  There is much more to these little spheres than you might think. Although the game of marbles was originally played by children, it grew into a fun pastime for adults as well. There are treasure hunts to find special marbles; collectors seek out old marbles as well as the beautiful creations of modern glass makers. Marbles have been used for play for thousands of years. In ancient Rome, nuts were used as game pieces. These were eventually replaced by clay balls. However, clay