<s>
In	O
science	O
fiction	O
stories	O
or	O
superhero	O
comics	O
,	O
X-ray	B-General_Concept
vision	I-General_Concept
is	O
the	O
supernatural	O
ability	O
to	O
see	O
through	O
normally	O
opaque	O
physical	O
objects	O
at	O
the	O
discretion	O
of	O
the	O
holder	O
of	O
this	O
superpower	O
.	O
</s>
<s>
The	O
most	O
famous	O
possessor	O
of	O
this	O
ability	O
is	O
DC	O
Comics	O
 '	O
iconic	O
superhero	O
character	O
,	O
Superman	B-Application
.	O
</s>
<s>
Among	O
the	O
best	O
known	O
figures	O
with	O
"	O
x-ray	B-General_Concept
vision	I-General_Concept
"	O
are	O
the	O
fictional	O
Superman	B-Application
,	O
and	O
the	O
protagonist	O
of	O
the	O
1963	O
film	O
X	O
.	O
</s>
<s>
The	O
first	O
person	O
with	O
X-ray	B-General_Concept
vision	I-General_Concept
in	O
a	O
comic	O
book	O
was	O
Olga	O
Mesmer	O
in	O
1937	O
's	O
Spicy	O
Mysteries	O
.	O
</s>
<s>
Although	O
called	O
X-ray	B-General_Concept
vision	I-General_Concept
,	O
this	O
power	O
has	O
little	O
to	O
do	O
with	O
the	O
actual	O
effect	O
of	O
X-rays	B-Library
.	O
</s>
<s>
Thus	O
,	O
Superman	B-Application
can	O
see	O
through	O
walls	O
to	O
see	O
the	O
criminals	O
beyond	O
,	O
or	O
see	O
through	O
Lois	O
Lane	O
's	O
dress	O
to	O
determine	O
the	O
color	O
of	O
her	O
underwear	O
(	O
in	O
Superman	B-Application
:	O
The	O
Movie	O
,	O
Warner	O
Brothers	O
,	O
1978	O
)	O
.	O
</s>
<s>
How	O
such	O
an	O
effect	O
might	O
be	O
created	O
via	O
x-rays	B-Library
is	O
unexplained	O
(	O
the	O
x-rays	B-Library
from	O
the	O
viewer	O
's	O
eyes	O
would	O
need	O
to	O
bounce	O
back	O
to	O
their	O
eyes	O
the	O
same	O
way	O
normal	O
light	O
reflects	O
off	O
objects	O
and	O
into	O
the	O
viewer	O
's	O
eyes	O
:	O
x-rays	B-Library
simply	O
pass	O
through	O
an	O
object	O
and	O
continue	O
on	O
their	O
way	O
.	O
</s>
<s>
X-ray	B-Library
films	O
are	O
made	O
as	O
x-rays	B-Library
pass	O
through	O
an	O
object	O
and	O
then	O
through	O
the	O
x-ray	B-Library
film	O
.	O
</s>
<s>
The	O
images	O
seen	O
on	O
x-ray	B-Library
film	O
are	O
"	O
shadows	O
"	O
of	O
the	O
objects	O
the	O
x-rays	B-Library
passed	O
through	O
on	O
their	O
way	O
to	O
the	O
film	O
)	O
.	O
</s>
<s>
As	O
depicted	O
,	O
x-ray	B-General_Concept
vision	I-General_Concept
is	O
actually	O
more	O
of	O
a	O
form	O
of	O
the	O
supposed	O
psychic	O
ability	O
of	O
remote	O
viewing	O
.	O
</s>
<s>
X-rays	B-Library
have	O
many	O
practical	O
uses	O
for	O
scientific	O
and	O
medical	O
imaging	O
.	O
</s>
<s>
Security	O
agencies	O
are	O
experimenting	O
with	O
applications	O
of	O
imaging	O
devices	O
which	O
can	O
"	O
see	O
"	O
through	O
clothing	O
(	O
using	O
terahertz	B-Architecture
waves	I-Architecture
)	O
.	O
</s>
<s>
Such	O
imaging	O
is	O
not	O
true	O
x-ray	B-General_Concept
vision	I-General_Concept
,	O
but	O
rather	O
shows	O
variations	O
in	O
heat	O
radiation	O
rising	O
from	O
the	O
skin	O
beneath	O
the	O
clothing	O
which	O
can	O
provide	O
some	O
detail	O
of	O
the	O
body	O
beneath	O
.	O
</s>
<s>
In	O
comic	O
books	O
in	O
the	O
latter	O
half	O
of	O
the	O
20th	O
century	O
,	O
there	O
often	O
appeared	O
an	O
advertisement	O
for	O
"	O
X-ray	B-Library
specs	O
"	O
which	O
displayed	O
the	O
face	O
of	O
a	O
smiling	O
boy	O
wearing	O
glasses	O
with	O
spirals	O
on	O
the	O
lenses	O
looking	O
at	O
his	O
hand	O
through	O
which	O
he	O
could	O
see	O
the	O
bones	O
.	O
</s>
<s>
While	O
X-rays	B-Library
cannot	O
be	O
used	O
in	O
practice	O
to	O
enable	O
seeing	O
objects	O
through	O
walls	O
,	O
researchers	O
have	O
recently	O
shown	O
how	O
everyday	O
wireless	O
signals	O
,	O
such	O
as	O
wi-fi	O
,	O
can	O
be	O
used	O
to	O
achieve	O
x-ray	B-General_Concept
vision	I-General_Concept
.	O
</s>
