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Relativity
is
relatively
easy
to
understand.
But
there's
one
aspect
of
relativity
that
consistently
trips
us
up.
It's
this:
we
not
only
tend
to
compare
things
with
one
another
but
also
tend
to
focus
on
comparing
things
that
are
easily
comparable,
and
avoid
comparing
things
that
cannot
be
compared
easily.
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