There are so many resources out there arguing for both sides on this one. You can gather masses of information to support either theory, but unhappily, not enough scientific proof to substantiate either one. Among the many papers, studies, and stories out there, I did find the below story very interesting though:
http://dsc.discovery.com/convergence/realeve/feature/feature.htmlTracy
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"When the debate is lost, slander becomes the tool of the loser." - Socrates
Vita contingit, Vive cum eo. (Life Happens, Live With it.)
"Life is not measured by the number of breaths we take, but by the moments that take our breath away." -- author unknown
"De omnibus dubitandum"