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Gas flint lighter with ignition from a flintlock. The construction consists of a hardened steel flint wheel and a piece of mish-metal sharps.
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Principle of the hammerless sledgehammer
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Control blood sugar with the help of an earring!

A student at the University of Huddersfield turned a simple piece of jewelry into a medical gadget.

The result of her labors is the Sense Glucose Earring, which uses safe high-frequency radio waves that travel through the lobe and provide data on the characteristics of the blood.

The information on the current blood sugar levels is sent to a special app on a smartphone in real time.
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Grains of sand from a sea beach in macro
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Thermal drilling of metal

Thermal drilling technology is based on the principle of plastic deformation of metal. In the process of impacting a thin-walled piece with a drill bit, due to the friction of the tool tip against the metal, the latter is plastically deformed and a through hole is formed.
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Comparison of sizes of space objects
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How to make movies with animals
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Thunderball⚡️

It is called a ball of energy floating in the air in the form of a luminous ball.

There is a theory that this phenomenon is a large drop of liquid atomic hydrogen, which is in an excited unstable state.

It arises as a result of electrolysis of water under the influence of fields and lightning currents. The specific weight of this substance is almost equal to the weight of air, which allows the lightning to "float".
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