Prior to 1959, which is when jet air travel was introduced in the United States, airlines did everything they could to try and distract passengers while they were on the airplanes, because they generally flew lower and they flew slower, and it was a much rougher ride, explains Janet Bednarek, an urban and aviation historian at the University of Dayton
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yellow high CO2 levels, orange atmospheric CO2, purple low CO2 levels the loss of water vapour from the leaves of plants
Dimensions: 3421 x 5131 px | 29 x 43.4 cm | 11.4 x 17.1 inches | 300dpi Date taken: 22 March 2010 More information: young man lighting up a cigarette