The final conclusion is basically consistent with Star's.
The change in Harrison Clark's body was a coincidence, the most incredible coincidence in history.
Every moment of cell division in the human body is actually a mutation.
Every person's body always contains "mutant cells".
The most notable and well-known result of mutations is the production of mutated cells like "cancer cells".
When cancer cells with infinite proliferative characteristics are produced and luckily evade the immune system's attack, which successfully reproduces, it becomes the cancer that ravaged humanity years ago.
The change in Harrison Clark's body can only be found in this irrational "rational explanation".
He mutated, and indeed, his trillions of cells all moved in the same direction, eventually reaching a 100% mirror-image overlap with the ancient Harrison Clark.
Although the renewal time of different cells in different parts of the human body varies, that is not important.
