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https://youtu.be/cik_GEQvXpo The closer and longer usage of the smart phone reduces the cognitive capacity of brain. The cognitive capacity is the ability to reason, decision making, information processing, learning, adaptability to change.  The researchers from McCombs School of business at  the University of Texas said having a phone within reach, even if it is switched off causes  loss of cognitive skills. The experiment conducted by the researchers conclude that when the people are successful at maintaining sustained attention as when avoiding the temptation to check their phones, the  presence of the mobiles within proximity affects cognitive capacity. First experiment: The first experiment was conducted with 500 people, these people were told to put their mobiles in 'silent mode' and place them either in their pocket or on  the desk  or in another room . Then they were then asked to complete cognitive capacity test.  ...