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In
Newton's
time
it
was
possible
for
an
educated
person
to
have
a
grasp
of
the
whole
of
human
knowledge,
at
least
in
outline.
But
since
then,
the
pace
of
the
development
of
science
has
made
this
impossible.
Because
theories
are
always
being
changed
to
account
for
new
observations,
they
are
never
properly
digested
or
simplified
so
that
ordinary
people
can
understand
them.
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