Another possible - the electronics in and around our homes...

Electromagnetic fields (EMF)
http://www.emfs.info/health/
http://www.who.int/peh-emf/about/Wha...en/index1.html
http://www.cdc.gov/niosh/topics/emf/
http://www.best-emf-health.com/emf-emissions.html
http://www.lifeenergyshields.com/sto...ons-dangerous/

Reduce EMF Exposure-
http://holisticsquid.com/8-easy-ways...-emf-exposure/
http://www.emfanalysis.com/basic-steps/


Something to think about and maybe try to limit excessive exposure.