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I read that electrons inside us are moving around 4.9 million miles per hour.

You are a little off-topic here, but you may no know it. The number you are referring to is (I think, but your number is a little high...) for the average (specifically, the r.m.s speed) of an electron which is one of many (classical) things all at the same temperature (that is,in thermal equilibrium), at the temperature of the human body.

If you're not familiar with these concepts, re-read the above but skip the stuff in parentheses.

Thank you for letting me know I am a bit off topic. I had just read this:

http://education.jlab.org/qa/electron_01.html

and converted to MPH. I was contributing something I thought was of interest and very much on topic.

You might like this one better: http://wiki.answers.com/Q/How_fast_do_electrons_move_between...

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