Interesting things that happened on this day:

• Sophie Germain, a notable female mathematician who made important advancements in number theory (in particular, proving Fermat's last theorem in the case where n=5) and mathematical physics, despite being repeatedly forced out of formal education, was born


• Sergei Rachmaninov was born


• Hannah out of S Club 7 was born


• Marvin Gaye was shot dead by his father in 1984


• The symbol "$" was invented by a New Orleans businessman in 1778.


• In 1952, the Alpher, Bethe (in absentia) and Gamov paper on the big bang theory was published


• The RAF was formed in 1918 with the merging of the Royal Flying Corps and the Royal Navy Air Service, which were branches of the army and navy respectively; thereby creating a third military service in its own right, with its own ministry.