[1]main-qimg-cdbb218765293ee7c1cc9d38f2182006One of my favorite
  little infographix.* The research for this is from the 1950s (I
  looked into it a few times in my life - always the same research
  papers) but nobody's shown it to be wrong just yet, that I've
  seen.

References

  Visible links
  1. http://icopiedyou.com/wp-content/uploads/2014/12/main-qimg-cdbb218765293ee7c1cc9d38f2182006.png

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