Welcome to #Checkin for Friday, September 17, 2021!

Good morning/evening/afternoon everyone and welcome to today's #checkin Can't believe it's Friday already!
On this day in, 1683, Dutch scientist Antonie van Leeuwenhoek is the first to report the existence of bacteria. Later he developed a revolutionary microscope. Unfortunately, he kept this technique for creating the lenses secret, so it only was that in the 19th century a similar resolution could be achieved. I, personally, think this is one of many great inventions that have advanced humanity! As a kid I had a computer game about Leonardo da Vinci, I really was fascinated by his ideas (although not all could work)

What do you think is the most influential thing that helped advance humanity? Not limited to technical inventions, could be art or poetry as well.

Greetings… Ahoj! Aloha! Bom dia! Bonjour! Bună! Ciao! G’day! Geia sas! Günaydın,
صباح الخير , בוקר טוב 你好! Hi! Hei! Hello! Hallo! Hola! Howdy! Halō! Håfa adai! Kamusta! Kia Orana! Kon’nichiwa! Mabuhay! Moi! Namaste! Ni Hao! Neih hou! Pagi! Saluton! Sawasdee! Shwmae! Γειάσας! Talofa! Terve! 😄

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