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.
Right! Barotrauma, which is the difference in pressure between the ear cavity and the outside environment that causes your ears to pop, occurs more often when you have a head cold, sinus infection, or any type of congestion. That's because the Eustachian tube doesn't always open when it's inflamed due to allergies or a cold.