A Computer Algorithm for Randomization

Back in the early days of computers, one of the more popular methods of generating a sequence of random numbers was to employ the following scheme: 1. Choose a starting number between 0 and 1. 2. Multiply the starting number by 4 ("stretch" it). Subtract 4 times the square of the starting number from the quantity obtained in step 2 ("fold" the interval back on itself in order to keep the final result in the same range). 3.Given a starting number between 0 and 1, we can use the proce-dureâ€...

 Video Game Violence is Not Violence

In the 1960s, as Bandura conducted his media effects research, the British folklorists lona and Peter Opie spent years observing and studying children's outdoor play. They watched children play games—many of them made up—with names like Underground Tig and Witches in the Gluepots and concluded, "A true game is one that frees the spirit. It allows no cares but those fictitious ones engendered by the game itself." When children commit to the games, they opt out of the ordinary world and "th...

 Teens Need a Psychological Moratorium

She remembered psychologist Erik Erickson's exhortation about teenagers: they need a "psychosocial moratorium," he wrote, an environment and a stretch of time in which they can explore different aspects of their personality and try on a series of identities without fear of consequence. In a way, that was what school was supposed to offer, but it didn't always do so with much success. She realized that this was exactly what virtual worlds offered all the time, to anyone with a computer and an ...

 The Connections in the Brain

Two neurons can communicate with each other at a synapse, which is the computational unit in the brain. The typical cortical synapse is less than a micron in diameter (10-6 meter), near the resolution limit of the light microscope. If the economy of the world is a stretch for us to contemplate, thinking about all the synapses in your head is mind-boggling. If I had a dollar for every synapse in your brain, I could support the current economy of the world for ten years. Cortical neurons on ave...

 The Birth of the Atomic Age

The Atomic Age began at exactly 5.30 Mountain War Time on the morning of July 15, 1945, on a stretch of semi-desert land about 50 airline miles from Alamogordo, New Mexico. And just at that instance there rose from the bowels of the earth a light not of this world, the light of many suns in one. ... At first it was a giant column that soon took the shape of a supramundane mushroom.