At your risk. This is not a medical advice.
A very important invention.
It operates because of the refraction of a light wave.
Refraction occurs because light finds the quickest path when it travels between mediums where the speed of light is different, for example air, glass. It bends in order to find the quickest path.
So the fish inside the sea is seen at a different position to where it is. Light inside water travels at a slower speed than in air.
And we can magnify the small letters of packaged food. And possibly protect ourselves from discovering on the ingredients list, vegetable oil or fat, margarine, palm oil or fat, etc which have a reputation of clogging blood arteries
Tahini (100% wholegrain seseme) may be one of the best foods on the planet, please do your own search).
see also
Refraction - Wikipedia
Trans fat - Wikipedia
Margarine - Wikipedia
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