Peter Cohen, of the Centre for Drug Research at the University of Amsterdam, followed a sample of cocaine users whom he describes as typical.

ECONOMIST: The harm done

The premise is that humans are vastly superior to computers at tasks such as pattern recognition, says Peter Cohen, director of the project at Amazon, so why not let software take advantage of human strengths?

ECONOMIST: Monitor

On Wednesday, Forbes.com Technology and Media Editor Peter Kafka interviewed Cohen on stage at the South by Southwest music conference in Austin, Tex.

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And for those of us of a certain age, there is always the tale of Peter A. Cohen, the 1980s investment banker, formerly with Shearson, who was a loser in the celebrated scramble for a leveraged buyout of RJR Nabisco.

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CNN's Tom Cohen, Peter Hamby, Paul Steinhauser, Kevin Liptak, Dana Bash, Chris Welch and Ashley Killough contributed to this report.

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