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How can you tell when a stock-market bubble is in fact a bubble, and therefore prone to burst? It’s when mania takes hold. And how on earth do you spot that? The options market provides the clues.
Our Buttonwood columnist
interprets them.
From one sort of extreme to another: this year’s El Niño climatic pattern could be the strongest on record.
We analyse
how that will change the weather all over the world. | 
