Since there are only 10 to the 80th power baryons in the universe, this means that an addition of just 10 to the 21st power baryons (about
the mass of a grain of sand) would have made life impossible.
Traditionally, the process involves plucking the inner cell
mass from a 5 - day - old embryo known as a blastocyst (a round ball
of 150 to 200 cells the size
of a
grain of sand), which destroys the embryo.