its a ccyle that is based on in breath and out breath inhale and exhale, the "nag" is just that forcceful "pop" sound your lungs and thorat and vocal cords make when u are doing Humming meditation and you have to change from an inhale to an exhale .....the evidence of the "big bang" is definitely there and you can studdy the Cosmic Background Radiation and anyone with an old analog TV can pick it up, its real, but iit wasntthe very "beginning" , theere are multiple dimenions it goes up and up and up forever never ends