On this day: June 21

POSTED: 01:10 AM MDT Jun 20, 2013    UPDATED: 12:00 AM MDT Jun 21, 2013 
first Ferris Wheel, 1893 Chicago Columbian Exposition

The first Ferris Wheel opens in Chicago, Lou Gehrig retires, Johnny Cash releases his first single, the WNBA begins play, and a TV icon and a blues legend both die, all on this day.