general public. 'I1,e response to foreign editions
of
this book (in
French, Italian, Spanish,
and
German) indicates
that
most readers
have
no
difficulty
in
follOwing
the
science
presented
here,
and
can
appreciate multidisciplinarity.
To some,
history (including evolution) is
~ot
a science, because
its results cannot
be replicated
and
thus cannot
be
tested by
the
experimental method.
But
studying
the
same
phenomenon
from
many different angles, from many
diSciplines, each.
of
which sup-
plies
independent
facts, has
the
value oflargely
independent
repe-
tition. This makes
the
multidisciplinary approach indispensable.
An important conclusion
that
emerges from this work is
that
human
genetic evolution has
been
heavily affected
by
technolOgical
innovations
and
by
cultural change, in general. Culture, meaning
the
accumulation
of
knowledge over generations, is
the
main differ-
ence between humans
and
other
animals (the difference is
one
of
degree, because animals, too, learn during
their
lives
and
transmit
knowledge
to
future generations). Cultural transmission
"is
thus an
important object
of
study,
one
that has
been
dramatically neglected.
Chapter
6
is
devoted to it.
'I1,e subject
of
this book has significant implications for important
social problems.
It
explains, among other things, why racism is falla-
cious. Genetics is instrumental in shaping us,
but
so, too, are
the
cul-
tural, social,
and
physical environments in which
we
live.
The
main
genetic differences are between individuals
and
not between popula-
tions,
or
so-called "races.» Differences
of
genetic origin among
the
latter are
not
only small (rapidly becoming even smaller with the
recent acceleration
of
transportation, and both migratory and cul-
tural exchange)
but
"also
superficial, attributable mostly
to
responses
to
the
different climates in which we live. Moreover,
there
are serious
difficulties in distingnishing between genetic and cultural
differ-
ences, between nature
and
nurture.
My greatest
hope
is
that
the
reader
experiences
the
same intel-
lectual pleasure I have with each expected
and
unexpected finding,
uncovering so many points
of
agreement among diSciplines
that
have
been
kept
carefully separate for so long.
VIII