August 21 in History August 21st is… National Brazilian Blowout Day National Senior Citizens Day Spumoni Day Sweet Tea Day 1883 – An F5 tornado struck Rochester, Minnesota, leading to the creation of the Mayo Clinic. 1888 – William Seward Burroughs patented the first practical adding machine in the United States (#’s 388,116-388,119). 1911 – […]