64:45
studying identical swimming find they tend to share your views about subjects
64:50
as diverse as modern art and the death penalty
64:53
in better
64:58
there identical
65:02
also usually closer to each other in IQ and returns
65:09
that have been shown to share similar susceptibilities to anger
65:12
stress thrill-seeking and happiness
65:18
but not every major characteristic twins inherited
65:25
and I'll
65:28
scientists now think for the environment in the world can have an effect
65:32
sometimes a dramatic one
65:40
fraternal twins derived from 2x
65:43
share half and jeans good
65:48
and IQ's of differ
65:52
yet new research is also finding Satele
65:54
variations in the IQ's identical said
66:01
good
66:04
at first this seems strange
66:07
for identical and very nearly
66:10
exact copies each other and have usually made the long journey through Jess
66:15
station
66:16
in very close proximity good
66:24
most identical twins share a single call me
66:27
and Apple a single food source and a single source
66:31
oxygen some identical
66:37
about 30 percent spit sufficiently
66:40
any after conception each acquired own Connie
66:44
and went and percent
66:54
studies show that the IQ's twins have separate percent
66:57
are more likely to vary in the IQ's twins
67:01
who shared presented
67:09
the minor differences in the quality and degree of food and oxygen a perceived
67:14
a sucky modified their brains and dust and mental abilities
67:26
sharing a percent can also lead to complications
67:29
if one twin restricts the passion to the other
67:32
I'll
67:35
advances in fetal surgery means that doctors
67:39
canal treats this condition using laser technology in the room
67:43
that was originally developed for the stones
67:47
project to bring down nuclear weapons
67:50
from space
67:54
in
67:58
of
68:01
we now 28 weeks into development and
68:09
one of the things the doctor pace particular attention to
68:12
is the umbilical and
68:18
this masterpiece have natural design is thick
68:21
and resilient it contains two arteries
68:26
defame that calling around each other in such a way
68:30
that they don't get naughty king
68:38
even if the umbilical cord wrapped around the baby's name
68:40
he can still deliver the vital nutrients
68:47
but for tweens sharing amniotic sac
68:50
peace life-giving supplying also presents
68:54
a unique changed
68:57
identical scan getting tangled in each other's Collins
69:00
cutting off the flow of lyndon oxygen either to themselves
69:05
all that kind tweeted
69:10
this 4d scan shows just such a situation
69:13
with heavily in tangled cords
69:23
the main reason that I tentacles who share a single
69:25
amniotic sac often delivered by Caesarean
69:29
is to reduce the risk entanglement at the most critical moment
69:33
when the babies in
69:39
way in the last weeks before bed
69:46
the babies are putting on as much weight as they can the larger and stronger Vale
69:53
the better then
69:58
of
70:00
at seven months Julie squads now weigh between half a kilo
70:05
to a kilo close to that predicted birth-weight
70:09
in
70:16
ok
70:17
one of the themes doctors look full is something called
70:21
twin to twin transfusion syndrome
70:30
I D ni all dependent at roughly the same rate
70:34
today all game roughly the same way
70:37
but identical
70:44
like to use like trees growing from the same result
70:49
as a result all harmlessly exchange blood across national percent in
70:56
then
71:00
in
71:05
however 0 between five to thirty percent
71:08
monozygotic twins the circulation between
71:12
becomes unbalanced and one gets too much blood
71:16
overloading his or her cardiovascular system
71:19
and made i from hot thing
71:26
the %uh the fetus does not get enough blood
71:29
and made i from severe me the
71:36
of
71:37
there are several complex reasons as to why it happens
71:40
is neither hereditary no genetic
71:44
but when it does happen
71:47
it normally comes between 15 and 28 weeks gestation
71:52
roughly the middle months of pregnancy
71:57
it can be treated by cutting off the blood supply from want women to the
72:00
other
72:01
using an endoscopic laser
72:09
before it was introduced twins with this track condition
72:12
only stood about a 20 percent chance to survive now
72:17
it's between 65 and seventy percent
72:26
of
72:34
of
72:36
of tripp Lite's and most of the way through destination
72:41
and after seven long months in the wood
72:45
they're about to glimpse their first few the outside world
72:49
I'm
72:53
while doctors monitor the ongoing health
72:57
the fetuses from the outside the feces bodies
73:01
also regulate and control and developed
73:05
at least to some degree
73:07
of
73:10
if one twin is not receiving enough blood in the world his body
73:14
will take steps to preserve the all-important brain
73:17
of
73:21
and he's actually able to regulate the for you
73:25
different parts of his body receives of
73:28
in this case pumping only a limited amoun