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Fifty-one percent of 16 year olds share their age/birth date with others Seventeen percent of teens keep their social network sites public and 19 percent only have some privacy settings enabled Twenty-nine percent of kids between five and 11 years old believe they are anonymous online Only a little over 50 percent of children age nine to 12 know how to block unwanted messages Nine percent of nine year olds share their email passwords and 24 percent of 18 year olds do the same Seventeen percent of male and 23 percent of female users would share inappropriate pictures online

The brain can get by on less energy when you overlearn a task

Decades of research have shown that superior performance requires practicing beyond the point of mastery.

Whenever we learn to make a new movement, Ahmed explains, we form and then update an internal model—a “sensorimotor map”—which our nervous system uses to predict our muscles’ motions and the resistance they will encounter. As that internal model is refined over time, we’re able to cut down on unnecessary movements and eliminate wasted energy.