On this day in 1898, American pharmacist Caleb Bradham invented the carbonated soft drink that would later be called "Pepsi-Cola".
On this day in 1963, Martin Luther King, Jr. gave his "I Have a Dream" speech.
On this day in 1991, Mikhail Gorbachev resigned as General Secretary of the Soviet Communist Party.
And on this day in 2003, an electricity blackout cut off power to around 500,000 people living in south east England and brought 60% of London's underground rail network to a halt.