Suming up what we should know.. Mental Math
http://www.worldometers.info/- measuring whats going on in the world
http://www.gapminder.org/world- graphing multiple subjects over a course of time.
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Suming up what we should know.. Mental Math
http://www.worldometers.info/- measuring whats going on in the world
http://www.gapminder.org/world- graphing multiple subjects over a course of time.
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