The existence of hydrogen (i.e., B) implies the strong nuclear force CANNOT be much stronger than it is (i.e., A).
This because P(B|not A)=0.
(Not A) means the Big Bang would have fused all hydrogen (H) to helium-4 (He-4) and left the observable universe without hydrogen, and so without water, and so without life as we know it.
Thus P(A|B)=1: i.e., strong nuclear force CANNOT be much stronger than it is (i.e., A) given that we have hydrogen (i.e., B).
The figure below (local link / general link: big_bang_nucleosynthesis.html) gives many of the details of Big Bang nucleosynthesis.
More generally, it seems likely that
the fundamental physical constants
and the cosmological parameters of
Big Bang cosmology
are fine-tuned for life as we know it
(see Wikipedia: Fine-tuned universe).
The anthropic principle
explains this by saying, they have to be that way for us to be here to observe them.
But this is NOT a satisfying or complete explanation.
Three possible further explanations occur to folks:
That we exist is is just
coincidence of that absolute logic.
But this
explanation invites the question
"What is the explanation for the
intelligent creator?"
The multiverse
is usually thought of as eternal and infinite.
The physics
and cosmology of each
pocket universe
is set randomly by some truly fundamental fundamental
physics.
The observable universe
is embedded in a particular
pocket universe
which is "JUST RIGHT" for life as we know it.
The multiverse is, in fact,
a lottery and
in a lottery
there are always
lucky
winners---see
the figure below
(local link /
general link: irish_sweepstake.html).
So many features of life,
humankind,
and human society just as it is
were determined randomly.
The winners may have thought it was all their own prowess.
The
dinosaurs
probably thought they were tough hombres---until that
asteroid did them in
(see Cretaceous-Tertiary (K-T) extinction event).
The great coincidence
is that the
angular diameters
Sun
and Moon
on the sky
are very nearly equal.
The two figures below
(local link /
general link: sun_moon_angular.html;
local link /
general link: devonian_speciation.html)
expand on the
great coincidence
and briefly discuss
anthropic principle argument why it
might NOT be just a coincidence.
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Yours truly thinks
in terms of the multiverse,
but all the explanations are highly speculative and probably NOT
mutually exclusive.
php require("/home/jeffery/public_html/astro/art/goldilocks.html");?>
php require("/home/jeffery/public_html/astro/art/irish_sweepstake.html");?>
Of course, inside the
observable universe taken
as a given and on Earth
itself, there were other
lotteries.
php require("/home/jeffery/public_html/astro/art/stag_at_sharkeys.html");?>
php require("/home/jeffery/public_html/astro/moon/sun_moon_angular.html");?>
php require("/home/jeffery/public_html/astro/biology/devonian_speciation.html");?>