Now you know thread.
 

Post interesting trivia in the “Now you know” thread.

I’ll go first. Some of the best “aviators” in nature do not have wings.

https://youtu.be/GRrUxi6d7so

Cool, I hope others add similarly intriguing items.

Why are manhole covers round?




They cannot fall into the hole they are covering as they could if they were square or rectangular.

why are port holes round??

so if water comes in....it doesn't hit you square in the face...

:scratch2:

Ha, You are on fire tonight!

Very interesting! Thanks!!

How It's Made - Alloy Wheels


https://www.youtube.com/watch?v=3ZZeOP_VFYU

The Real Meaning of E=mc²

https://youtu.be/Xo232kyTsO0

The oldest living tree in the world, 5067 years "young", is the Bristlecone Pine in the Great Basin. At the time when it was already 1000 years old, the last of the Mammoths had died at the Wrangel Island (Arctic Ocean). :smoking:

http://dostoevsky17.com/wp-content/u...-vremeni-7.jpg








At the time Nintendo company was formed (they were making Hanafudu playing cards in 1889), Jack the Ripper was in the news.

http://dostoevsky17.com/wp-content/u...-vremeni-6.jpg






Star Wars came out in 1977, the same year France had it's last Guillotine execution. :sigh:

http://dostoevsky17.com/wp-content/u...-vremeni-8.jpg