Collective Synchronisation.

Scientists have been able to understand why London's Millenium wheel swayed from side to side in the year 2000, just two days after its opening.

The reason...collective synchronisation !

According to Steven Storgatz, of Cornell University at Ithaca, New York, states,

• "The phenomenon was that people who were walking at random, at their own favorite speed, not organized in any way spontaneously synchronized"
• "That's the phenomenon. Why did they all start moving in step? They did it unconsciously. That is what nobody had thought about and engineers did not anticipate."

Wow ! Now there's a phenomenon that no one had encountered before !