Oscillation in an elastic medium

When striking the tuning fork, vibrations arise inside, they are almost invisible, only slightly audible. As soon as the horns of the tuning fork are submerged in water, a whole storm is born.
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Strasbourg, France
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Milan
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X-ray of a dog that eats
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▫️ Map of the distribution of black earth in the world

Just over half of the world's black earth is concentrated in the southern regions of Russia - a large part of a huge belt stretching from Austria and Croatia to the northern regions of China. And this potential wealth remains largely underutilized.

A second, much smaller black-soil belt is found in the northern regions of the United States and southern regions of Canada. There are some areas with black earth or soils of similar quality in South America as well
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Gdansk
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A television for families who can't decide what to watch in the evening

Thanks to special glasses, everyone can watch his/her own program. Okay, but what about the sound?
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How the door lock works
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A full-fledged drone that will fit in your pocket.
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Mother Cat scolds kitten for messing up the bed and fixes it herself.

Kanye West in 1994 wearing a shirt that says: “Say no to Nazis”