The generation of random numbers has many uses (mostly in statistics, for random sampling, and simulation). Before modern computing, researchers requiring random numbers would either generate them through various means (dice, cards, roulette wheels, etc.) or use existing random number tables.
Yawning, swallowing or chewing helps open the small canal (Eustachian tube) which connects your middle ear in the inner side of the ear drum, and equalizes the pressure with the outer side and causes the sensation of ears popping when swallowing.
Most likely you are experiencing is sinus drainage. There is fluid that builds up in our sinus cavities which are located all over your head, it causes pressure and the sensation is sort of like your ears popping, it's the sinus fluid draining from your ears or other cavities and it all runs through your head. It's a very common occurrence.