|This picture allows us to set a lower bound on the number|
of creatures that ever lived of ~4.
Anyways, I didn't really make it too far in the book. In fact, I only made it to the first sentence of the second paragraph of the first chapter, when I encountered this line:
"The number of individuals which has populated the Earth since life began is beyond estimation."
Horse feathers, I say! Horse Feathers!
The number of things that ever lived may very well be unknowable, but it's certainly not beyond estimation. So below, Alemi and I each provide an estimate for the total number of creatures that have ever lived on Earth.