While some Hubs have blown me away regarding the knowledge that they impart, it was actually a discssion in the Answers forum that had the most profound impact on my thought processes. Someone noted that the only thing that really separates modern mankind from wild animals is our knowledge that we use and pass on, which is why education is so important. Woah! That's pretty basic, but also quite deep.
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Thanks for the input fpherj48. The variety of topics covered is what keeps HubPages interesting to me. You never know what you're going to come across and what you are going to learn when reading Hubs.