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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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