In this issue:

"A Change of Mind" by Bonnie Rochman.

"Kindergarten for Computers" by Will Knight.

"Are Young Athletes Risking Brain Damage?" by Amanda Schaffer.

"Hot and Violent" by David Rotman.

"Stop Emissions!" by Ken Caldeira.

"A Sensible Climate Policy" by Richard Martin.

"The End of Internet Advertising as We've Known It" by Doc Searls.