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When you turn on your GPS receiver - what happens? Well, lots of stuff. But primarily, GPS receivers work in a two stage process: 1) Look for available satellites to track 2) Do everything else. In this article, I want to focus on step 1, we'll get to step 2 later.

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The day Dr. David Dao was dragged off of a United plane so United employees could get to their next destination was significant for another, possibly longer-lived reason that the sheer brutality it portrayed.

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I've recently been listening Brian Greene's The Elegant Universe and in it, he explained why Einstein started to question Newton's theory of gravitation at all. The theory explained all observational evidence - there were no experiments in that time that could not be explained by the theory. Why question it?