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.
With eustachian tube dysfunction, fluid may collect in the middle ear because it cannot drain properly. Then, with a yawn or chewing motion, or other maneuver that opens the tube temporarily, the liquid and pressure may suddenly be relieved, leading to the popping sensation.