Your nostrils are manual switches for your nervous system.
A short YouTube video by Niraj Naik presenting nostril-specific breathing techniques as manual switches for the nervous system. The speaker claims that: left-nostril-only breathing for 21 breaths calms the nervous system; right-nostril-only breathing for one minute increases alertness without caffeine; and plugging the left nostril with cotton wool for one hour can stop a runny nose.
Questions this video answers
21 breaths (left nostril only).
One minute (right nostril only).
Plug the left nostril with cotton wool for one hour.
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