Leif Erikson Day
1676 – Antonie van Leeuwenhoek wrote a letter to the Royal Society describing "animalcules" – the first known description of protozoa.
1874 – The Universal Postal Union, then known as the "General Postal Union", was established with the signing of the Treaty of Bern to unify disparate postal services and regulations so that international mail could be exchanged freely.
1913 – Carrying a cargo hold full of highly flammable chemicals, the ocean liner SS Volturno caught fire in the north Atlantic and sank, resulting in 136 deaths.
1986 – The Phantom of the Opera (scene pictured), a musical by Andrew Lloyd Webber and currently the longest-running Broadway show in history, opened in London's West End.
2012 – Pakistani activist Malala Yousafzai was severely injured by a Taliban gunman in a failed assassination attempt.