On This Day🌄 October9

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 …

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