Category Useful Tips

How to measure center distance (PD)?
Useful Tips

How to measure center distance (PD)?

How to measure interpupillary distance: methods and instructions The correct wearing of glasses depends on the selection of lenses and frames. Interpupillary distance allows you to determine the centering of the lens relative to the pupils of the patient.

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Useful Tips

Natural food colors at home

How to make food coloring at home? Food colorings recipes As a rule, visitors to restaurants and cafes pay attention not only to the taste of the served dishes, but also to the way they are decorated.
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Useful Tips

Learn to shoot from a bow

How to shoot from a bow? Archery target. Shooting technique Archery is not an easy process. To hit the target, you need a full concentration of attention, proper breathing and precise motor actions.
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Useful Tips

How to Make a Puff of Air Rice

Production Secrets In industry, in order to obtain air rice, it is necessary to treat it with various chemical and physical influences: Clean, dry rice is influenced by high temperatures and pressure.
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Useful Tips

Uranium enrichment

How is uranium enriched? Enrichment of uranium is one of the key steps in creating nuclear weapons. Only a certain type of uranium works in nuclear reactors and bombs.
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