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"Liftoff to Learning: All Systems Go!" NASA Quest. NASA, Mar. 2010. Web. 
            8 May 2010. 
            <http://quest.nasa.gov/space/teachers/liftoff/system.html>.

Lujan, Barbara F., and Ronald J. White. "How the Human Body Changes in Space." 
            Human Physiology in Space. National Space Biomedical Research Institute, 2009. Web. 8 May 2010. 
           <http://www.nsbri.org/HumanPhysSpace/introduction/intro-bodychanges.html>.

"Microgravity: Zero g and Mars g." NASA. N.p., 17 June 2008. Web. 7 May. 2010. 

          <https://aerospacescholars.jsc.nasa.gov/HAS/Modules/Earth-to-Mars/9/6.cfm>.


"Space Travel and the Effects of Weightlessness on the Human Body." Canadian 
           Space Agency. N.p., 7 May 2010. Web. 8 May 2010. 
          <www.asc-csa.gc.ca/pdf/educator-microgravity_science_stu.pdf>.