There is the other side of the coin also. Peacock says; “I almost think that it is the ultimate destiny of science to exterminate the human race”. That is the other point of view. It is science, which gave birth to destructive weapons like dynamite, guns, rifles, rockets, atom bombs, hydrogen bombs etc. it is science that gave electrical power and nuclear power. If nuclear power is used for peaceful purposes, there is no need for fear. But after all it is human to err. Can anyone say that there is no chance of the destruction of a Hiroshima or a Nagasaki being repeated? If that happens, will not science be a bane of humanity?
But it is not easy to determine how good a ceiling fan is simply by examining the fan’s individual design features. It is the net or combined effect of these individual fan features that determines how much airflow can be generated. For instance, Falahat’s study, as previously discussed, revealed that four blades were the optimum number of blades. However, a two-blade ceiling fan could still generate more airflow than a four-blade ceiling fan. One way is to increase the blade pitch of the two-blade fan until the pitch is large enough to generate more airflow than the four-blade fan.