http://www.trailfire.com/Newbie/trails/39816Newbie/trails60http://www.trailfire.com/Newbie/marks/112287Great Ideas That Got Made NewbieFri, 22 Jun 2007 22:59:29 -0700trailfire:markId:112287http://www.trailfire.com/Newbie/marks/112289A country’s growth is measured in terms of its GDP- Gross Domestic Product. This important economic measurement was arrived at in the twentieth century by American economists. Read all about how it came into being. Before this calculation, decisions of economic importance at national levels were taken based on varied data like stock price indices, freight car loading statistics and the like.

]]>Great Ideas That Got Made NewbieSun, 17 Jun 2007 22:48:55 -0700trailfire:markId:112289http://www.trailfire.com/Newbie/marks/112290Great Ideas That Got Made NewbieSat, 23 Jun 2007 05:29:46 -0700trailfire:markId:112290http://www.trailfire.com/Newbie/marks/112292Did you know that the first air conditioning was in use in Persia thousands of years ago? Wind shafts placed on roofs would route air through cold water and let it inside buildings. Cool eh? Later on it was discovered that gases could be used to cool air. Read all about how modern air conditioning came into being and learn how air conditioners work.

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