On January 24, 1848, James W. Marshall found gold at Sutter’s Mill in Coloma, California. That discovery set into motion the 1849 California Gold Rush. Over 300,000 people migrated to California to seek their fortune, many traveling all of the way from the East Coast in covered wagons. Today, there is a different kind of gold in California. It is a type of gold that is precious to brewers, a microscopic gold. The topic of this entry is the wealth of Saccharomyces and non-Saccharomyces yeast species held by the University of California, Davis.