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The ellipsograph (or Archimedes' net)

If you look closely, you can see that each ball moves in a straight line.
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Part of ancient Roman water system found in Stabiae, near Pompeii, Italy
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A street barber in Cairo. Egypt, 1936.
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Fred Warner
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🇬🇧 Women sit near the Avon River with Holy Trinity Church behind in Stratford in 1929. Original autochrome colour photo
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Bernkastel-Kues
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The 10 most visited countries in Asia
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1961, East German police and soldiers begin erecting the Berlin Wall.
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As with all muscles, the heart sometimes needs to relax

It stops for a moment after each beat and fills up with blood. The coronary arteries, located on the outer surface of the heart, serve to ensure the heart muscle itself receives blood (and oxygen) while it awaits the next contraction.
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POV video of eagle flying down from the top of the Burj Khalifa, the world's tallest building
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