I've read that our bodies contain tens of trillions (10 raised to 12th power) of cells! Each one has a mind of its own and wants to survive badly. Of course, there are bad actors who go rogue and cause havoc.

Trillions enclosed within multi-layer cells called the skin. We are nothing but a sack of cells.

Oh, yeah, you guessed right, I'm just reading "The Song of The Cell" by Siddhartha Mukherjee.

Listen to his interview on Fresh Air.
https://www.npr.org/sections/health-shots/2022/11/21/1137123838/a-cell-biologist-shares-the-headiness-of-researching-lifes-most-fundamental-form