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A lot of attention has been given to the consequences of the latest  strong El Ni\~{n}o event. People oftenoften  talk about meteorological phenomena as El Ni\~{n}o (or La Ni\~{n}a) conditions, but what are  these, and how do we come about our notions of what is a 'typical' El  Ni\~{n}o event? How consistent do we expect the effects of this