January 18: The Week of Prayer for Christian Unity begins
Legionella sp. under UV illumination
- 1535 – Conquistador Francisco Pizarro founded Ciudad de los Reyes, present-day Lima, Peru, as the capital of the lands he conquered for the Spanish Crown.
- 1871 – A number of independent German states unified into the German Empire, with Prussian King Wilhelm I being proclaimed as its first Emperor.
- 1919 – World War I: The Paris Peace Conference opened, to set the peace terms for the Central Powers.
- 1958 – African Canadian Willie O'Ree of the Boston Bruins played his first game in the National Hockey League, breaking the colour barrier in professional ice hockey.
- 1977 – The mysterious Legionnaires' disease was found to be caused by a previously unknown bacterium now known as Legionella (pictured).
More anniversaries:
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