What are you watching on YouTube now ?

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if you listen to the wind it does have a locomotive sound to it as the weight of each axle rolls over slight changes in the rails/track (I guess)
 
wow, I didn't even watch the rest of the video... thats some amazing footage, I assume that was a drone following the twister... and that was a small one, imagine some of those things can be over a mile in diameter
 
 
I had my credit card out ready to buy what was on offer before I realized what it was...

Instead I watched a passably good presentation of an interesting topic.
Unfortunately, the lecturer had to spend too long on the background material (for us ignoramuses)
and the motivation for the whole field.
 
I've got a circular slide rule that my grandfather--in-law gave me.
TIL they were invented around 1640.
 
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