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What explains the colorless flies seen by many people flying in the air? Detailed answer

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What explains the colorless flies seen by many people flying in the air?

Many people see colorless "flies" flying in the air, especially when looking at a brightly lit surface, such as a clear sky. This effect has a scientific name - destruction of the vitreous body. Ideally, the vitreous body of our eye is a transparent gelatinous substance, but due to diseases, injuries, increased stress on the eyes, or simply age-related changes, individual fibers in it thicken and lose transparency, which is perceived by us as flies. Usually, the destruction of the vitreous body is not dangerous and does not cause complications, but if the flies appear very sharply, accompanied by flashes of light, this may indicate an imminent retinal detachment, which leads to blindness.

Authors: Jimmy Wales, Larry Sanger

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Where is the symbol of the swastika on maps still used to designate temples?

The swastika, one of the oldest graphic symbols, had a positive meaning among most peoples and was a symbol of the movement of life, the Sun, prosperity. Even now, despite the negative associations of the swastika with Nazism, the symbol continues to be used in its old meaning - for example, on Japanese maps as an icon of Buddhist temples.

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