|Karl Schwarzschild physics
The first exact solution of general relativity for a single spherical non-rotating mass led to the derivation of the gravitational radius, associated with every quantity of mass, and the event horizon of a non-rotating black hole.
A point in spacetime at which matter has infinite density and infinitesimal volume. All matter of the universe in less than a dot less than a moment before the big bang. The future time when computer intelligence becomes capable of improving itself. The myth of individual uniqueness, also known as the Lake Wobegon syndrome.
There might come a time when all that you know and love dissolves, and your challenge would be to rely on whatever makes you human. You would need to gather whatever is left and make another life, somewhat, inescapably, like the life before.