2 things science and human progress accomplished on this date.
1903
The first powered airplane flight
The Wright brothers made the first controlled, powered flight of a heavier-than-air machine at Kitty Hawk, North Carolina. The first hop lasted just 12 seconds but launched the age of aviation.
Chemist Otto Hahn split the uranium atom, discovering nuclear fission. The finding unlocked a vast new source of energy that now powers cities around the world.