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12/16. The DNA of the Universe

String theory predicts not one, but many, sets of laws of physics.
Hence the Multiverse.
String theory predicts 10 (or 11, or 12) spacetime dimensions,
but our Universe has only 4.
(Why 4 spacetime dimensions?
Stable bound gravitational orbits around spherical masses exist only in 4 spacetime dimensions.)

String theorists postulate postulate that the hidden dimensions
are curled up into a “Calabi-Yau” complex manifold.
The topology of the Calabi-Yau manifold
determines the DNA of the universe.
What is the point of having DNA if you don't use it?

Suppose that there exist laws of physics that allow a universe to reproduce.
Reproducing universes fill the Multiverse with their progeny.
Finding oneself in a reproducting universe would be common.

13/16. Extreme energy collision