Question

-------------- is unexpected events that are very hard to predict

Answer 1

Black Swan

is an unexpected event that is very hard to predict.

▶▶A black swan is an unpredictable event that is beyond what is normally expected of a situation and has potentially severe consequences. Black swan events are characterized by their extreme rarity, severe impact, and the widespread insistence they were obvious in hindsight.

▶▶A Black Swan event is an event in human history that was unprecedented and unexpected at the point in time it occurred.

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Answer 2

Answer:

Probability and Natural phenomena...