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You know the old Hubble Deep Field photo from 1995 that contains over 3,000 galaxies? You know how large an area of the night sky that image represents? Hold a dime at arm's length and look at Roosevelt's eye. That's the size of the area of sky seen in that image, which prior to that image was believed to be empty.

HubbleDeepField.800px.jpg
There are roughly more than 100 billion of galaxies in the observable universe, each one containing hundreds of billions to trillions of stars.
 
ECG apparatus. To see lead I, II and III.
Illustration in a book from 1929.
It is the same principle today - with a wire to both arms and one leg.
But more advanced with some wires on the chest too.
IMG_2817.jpeg
 
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