SPACE - Houston, we have another problem: Study shows space travel is harmful to the brain

(Phys.org)-As if space travel was not already filled with enough dangers, a new study out today in the journal PLOS ONE shows that cosmic radiation - which would bombard astronauts on deep space missions to places like Mars - could accelerate the onset of Alzheimer's disease.

http://phys.org/news/2012-12-houston-problem-space-brain.htm