Events seem random when we don't understand why they happen. Perhaps these seemingly random events are not mistakes at all; they may be events caused by mechanisms that are unknown. How do we explain the increase in the frequency of cancers when comparing to 100 years ago when cancer was a relatively rare disease?
Your keywords determine which category will be chosen for your video. Use keywords like health, technology, science, politics, food, etc., to make sure your video goes into the category you wish.