Conjoined twins sharing a brain!

http://www2.macleans.ca/2010/11/02/a-piece-of-their-mind/print/

Sad, but also fascinating.  Which is perhaps another sadness.  Besides the obvious, these girls' lives are going to be one long science experiment, with legions of doctors and scientists examining them and their lives.  Me, a total amateur, can think of at least twenty major questions right off in examining personality development, perception, hormonal influences, right brain -left brain issues, etc.