The piston pump

When the piston moves upward, the liquid under atmospheric pressure enters the tube, lifts the bottom valve and moves behind the piston.

When the piston moves downward, the liquid under the piston presses on the bottom valve and it closes.
At the same time, the pressure of the fluid opens the valve inside the piston, and this fluid moves into the space above the piston.
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This is how climbers sleep on steep cliffs
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Bloggers in the USA launched a rocket-powered Christmas tree

How's that for you, Elon Musk?
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Robots also have traffic jams
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By comparison, 4,500 years ago, pyramids were built from roughly the same blocks.
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Treadmill for dogs
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Hidden camera footage of North Korean village life.

A little more about the surface tension of water
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Budapest
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Dogs understand that people do not see well in low light conditions, so they prefer to steal food in the dark.
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A rainbow from chemists.
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It turns out that one bee family harvests up to 150 kg of honey in the summer.
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Inside a bushfire in Victoria, Australia
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Sewing machine mechanism from the 20th century
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The leaves of the Victoria lily can comfortably accommodate a person.
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Places in Europe that are wetter/drier than London
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Sulfuric acid against a paper roll
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In ancient Eygpt instead of police dogs, they would send an angry male baboon after you.

Tokyo
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