It
was
probably
people
in
____________________
who
first
began
to
use
____________________
for
cooking
,
about
800
,
000
or
a
million
years
ago
.
People
had
always
known
about
fire
,
because
fires
happened
naturally
when
there
were
lightning
____________________
or
sparks
from
two
____________________
hitting
together
.
Probably
the
first
people
who
made
their
own
fires
started
them
from
fires
that
were
already
going
.
Then
they
figured
out
how
to
make
fires
by
hitting
flints
together
or
by
rubbing
two
____________________
together
.
Fire
was
a
very
early
invention
,
only
a
little
after
simple
tools
like
stone
choppers
,
and
before
clothing
.
Making
their
own
fires
let
people
____________________
their
food
.
Cooked
food
is
easier
to
digest
than
raw
food
,
and
people
can
get
more
____________________
from
it
with
less
work
.
This
extra
energy
may
have
been
what
helped
people
grow
bigger
brains
than
____________________
,
and
get
smarter
so
they
could
invent
other
things
.
At
the
same
time
,
once
people
needed
fires
to
cook
their
food
,
they
couldn't
just
go
off
alone
into
the
forest
-
they
needed
to
all
sit
together
around
their
fire
.
In
the
____________________
Age
,
it
was
too
hard
to
make
your
own
fire
.
This
encouraged
people
to
learn
to
get
along
with
each
other
and
cooperate
instead
of
fighting
,
and
helped
to
form
organized
____________________
.
