1915
Λουβέν: η πρώτη μεγάλη καταστροφή πόλης στον 20ο αιώνα.
θεωρία της μετατροπής του υδρογόνου σε ήλιον (υδρογονοβόμβα),
χρήση δηλητηριωδών αερίων. /
World War I: Second Battle of
Ypres - German troops introduce poison gas at Ypres, Belgium.
The first prototype tank is tested for the British Army for the first time.
George Claude patents the neon discharge tube for use in advertising.
The controversial film The Birth of a Nation by D.W. Griffith
premieres (Los Angeles, California)
Albert Einstein publishes his theory of general relativity.
Arnold Sommerfeld develops a modified Bohr atomic model with elliptic orbits
to explain relativistic fine structure