Who the human being is, what he is capable to do, how does the world function-are understandings produced by accumulative experience.
Though revisions are constant, they happen usually at such a slow path in relation to the shortness of individual human life, that they are mostly not perceived.
There are moments, however, that human life is so radically disrupted that the slow changes in understandings take unexpected turns.
The 21st century is different in that the rate of “the “unexpected,” the need to change and to adapt to them, is faster than in previous periods.
To expect the unexpected, to be ready to adjust to changes is the 21st-century main challenge.