Why cops should trust the wisdom of the crowds
• New ScientistTHE protests that took place on the streets of London on the eve of the
G20 summit in April lived up to many people's expectations. Around 2000
protestors turned up, and were heavily marshaled by police. There was
a bit of trouble, but the police tactics - specifically, the decision
to corral the entire crowd into a small area near the Bank of England,
an approach known as "kettling" - kept a lid on the violence.
