If you doubt the negative side of multi-tasking consider one very simple statistic. In the US, 2,600 people die and 330,000 are injured every year because they are doing two things at once. You might believe that you can drive and think at the same time and indeed you can. To drive a car requires several layers of thinking to happen simultaneously. But when you add another conscious activity like talking on a phone or trying to read a map, it appears that the consequences can be fatal.