<s>
FlexBook	B-Application
is	O
a	O
textbook	O
authoring	O
platform	O
developed	O
by	O
the	O
CK-12	O
Foundation	O
launched	O
in	O
2008	O
,	O
focused	O
on	O
textbooks	O
for	O
the	O
K-12	O
market	O
.	O
</s>
<s>
Derived	O
from	O
the	O
words	O
"	O
flexibility	O
"	O
and	O
"	O
textbook	O
,	O
"	O
a	O
FlexBook	B-Application
allows	O
users	O
to	O
produce	O
and	O
customize	O
content	O
by	O
re-purposing	O
educational	O
content	O
using	O
different	O
modules	O
.	O
</s>
<s>
FlexBooks	B-Application
can	O
be	O
designed	O
to	O
suit	O
a	O
learner	O
's	O
learning	O
style	O
,	O
region	O
,	O
language	O
,	O
or	O
level	O
of	O
skill	O
,	O
while	O
adhering	O
to	O
the	O
local	O
education	O
standards	O
.	O
</s>
<s>
FlexBooks	B-Application
are	O
designed	O
to	O
overcome	O
some	O
of	O
the	O
limitations	O
of	O
traditional	O
textbooks	O
.	O
</s>
<s>
Anyone	O
–	O
including	O
teachers	O
,	O
students	O
,	O
and	O
parents	O
–	O
can	O
adapt	O
,	O
create	O
,	O
and	O
configure	O
a	O
FlexBook	B-Application
.	O
</s>
<s>
Some	O
FlexBooks	B-Application
features	O
include	O
:	O
</s>
<s>
Each	O
CK-12	O
FlexBook	B-Application
is	O
created	O
under	O
Creative	O
Commons	O
Attribution-Non-Commercial	O
3.0	O
Unported	O
(	O
CC	O
BY-NC	O
3.0	O
)	O
License	O
,	O
giving	O
its	O
author/user	O
a	O
right	O
to	O
share	O
(	O
i.e.	O
,	O
right	O
to	O
copy	O
,	O
distribute	O
and	O
transmit	O
the	O
work	O
)	O
a	O
right	O
to	O
remix	O
(	O
i.e.	O
,	O
right	O
to	O
adapt	O
the	O
work	O
)	O
.	O
</s>
<s>
In	O
March	O
2009	O
,	O
FlexBook	B-Application
was	O
acknowledged	O
as	O
“	O
an	O
adaptive	O
,	O
web-based	O
set	O
of	O
instructional	O
materials	O
”	O
by	O
Virginia	O
officials	O
when	O
members	O
from	O
Virginia	O
's	O
K-12	O
physics	O
community	O
along	O
with	O
university	O
and	O
industry	O
volunteers	O
developed	O
an	O
eleven	O
chapter	O
FlexBook	B-Application
titled	O
“	O
21st	O
Century	O
Physics	O
FlexBook	B-Application
:	O
A	O
Compilation	O
of	O
Contemporary	O
and	O
Modern	O
Technologies	O
”	O
in	O
just	O
4	O
months	O
.	O
</s>
<s>
In	O
September	O
2010	O
,	O
NASA	O
teamed	O
up	O
with	O
CK-12	O
to	O
add	O
a	O
chapter	O
on	O
“	O
modeling	O
and	O
simulation	O
”	O
to	O
the	O
existing	O
Physics	O
FlexBook	B-Application
created	O
earlier	O
.	O
</s>
<s>
Wolfram	O
has	O
teamed	O
up	O
with	O
CK-12	O
to	O
produce	O
interactive	O
FlexBooks	B-Application
with	O
Wolfram	O
demonstrations	O
embedded	O
into	O
the	O
FlexBooks	B-Application
.	O
</s>
