The Biological Weapons Convention entered into force on 26 March 1975. This year therefore marks the 40th anniversary of the Convention. This milestone in the life of the Convention will be marked by a special commemorative event which took place on 30 March 2015 in the Council Chamber of the Palais des Nations in Geneva, which is where the BWC was originally negotiated. A special anniversary webpage has been created at www.unog.ch/bwc/bwc40 which contains more information about the commemorative event and about the history of the BWC.