On this day: February 20

POSTED: 4:12 PM PST February 19, 2013    UPDATED: 11:00 PM PST February 19, 2013 
John Glenn entering the Mercury Friendship 7 capsule

The Post Office is born, World War II gets its first flying ace, John Glenn becomes the first American to orbit the Earth, and a fire at a Great White concert leaves 100 dead, all on this day.