My favorite trick: if you want to increase Nitric oxide bubbles (the ‘gaseous signaling molecule’)?
Hum through your nose. When it makes that buzzing noise, your nasal passages have gone supersonic, making lots and lots of those tiny little NO bubbles.
Will that help you think or form new memories or make your heart work better, among other effects?
I don’t know. But, it does make more NO in the body.