Many of us believe that science is something modern ...(1)... the truth is that ...(2)... has been using science for ...(3)... very long time. However, it has ...(4)... a greater effect on human lives in the last 25 ...(5)... 30 years than in the hundreds of years ...(6)... the invention of the plough. The ...(7)... gifts of science have modern life ...(8)... and comfortable. But science has ...(9)... the same time created new problems. one of these which may become ...(10)... in the years to come, is ...(11)... of "jet-lag". With the coming of modern jets. flying at more than 900 km/hr, the world ...(12)... very small indeed. Today if you ...(13)... New Delhi at 4.00 in the morning, you ...(14)... eat an early breakfast in the sky ...(15)... kabul, and be in London by about 1.00pm.
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