It would take as many human bodies to make up the sun as there
are atoms in each of us. The geometric mean of the mass of a
proton and the mass of the sun is 50 kilograms, within a factor
of two of the mass of each person here. Sir Martin Rees in a TED
lecture. He suggests that humans have evolved to this scale, an
almost beautiful mean between stars and atomic particles,
because we must be large enough to permit massive complexity in
structure while small enough to experience minimal gravitational
effects. It always makes me feel rather happy to think that
everything had to be just so for our world, as we know it, to
occur. Rees calls this quality of the universe its biophilia and
describes it more here.